appsc chemistry bits

1 Q)Which of the following is the lightest metal?

(a) Mercury(b) Silver(c) Lithium(d) Lead

Hide AnswerC

2 Q)The most important ore of aluminium is

(a) bauxite(b) calamine(c) calcite(d) galena

Hide AnswerA

3 Q)The element present in the largest amount in rocks and minerals is

(a) carbon(b) silicon(c) hydrogen(d) aluminium

Hide AnswerB

4 Q)An alloy used in making heating elements for electric heating devices is

(a) solder(b) alloy steel(c) nichrome(d) German silver

Hide AnswerC

5 Q)German silver is an alloy of

(a) copper, nickel and silver(b) silver, copper and aluminium(c) zinc, copper and nickel(d) silver, zinc and copper

Hide AnswerC

6 Q)Match the following : ABCD will correctly match withA.Aluminum1Monazite

B.Uranium2Pitchblende

C.Thorium3Bauxite

D.Lead4Galena

5Haematite

(a) 5 3 2 4(b)3 2 4 1(c) 3 2 1 4(d)2 3 1 5

Show Answer

7 Q)Diamond is an allotropic form of

(a) silicon(b)carbon(c) sulphur(d)germanium

Hide AnswerB

8 Q)Air is a/an

(a) compound(b)element(c) mixture(d) electrolyte

Hide AnswerC

9 Q)Which of the following is the best conductor of electricity?

(a) Ordinary water(b) Sea water(c) Boiled water(d) Distilled water

Hide AnswerB

10 Q)Balloons are filled with

(a) helium(b) oxygen(c) nitrogen(d) argon

Hide AnswerA

11 Q)The charcoal use to decolourise raw sugar is

(a) animal charcoal(b)sugar charcoal(c) coconut charcoal(d) wood charcoalHide AnswerD

12 Q)The most abundant metal in the earths crust is

(a) zinc(b) copper(c) aluminium(d) ironHide AnswerC

13 Q)Production of chlorofiuorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products ?

(a) Television(b) Tubelight(c) Cooking gas(d) RefrigeratorHide AnswerD

14 Q)The gas used to extinguish fire, is

(a) neon(b) nitrogen(c) carbon dioxide(d) carbon monoxideHide AnswerC

15 Q)In which of the following activities silicon carbide is used ?

(a)Making cement and glass(b)Disinfecting water of ponds(c)Making casts for statues(d)Cutting very hard substancesHide AnswerD

16 Q)The element common to all acids is

(a)carbon(b) hydrogen(c) oxygen(d) sulphurHide AnswerB

17 Q)Gobar gas contains mainly

(a)methane(b)carbon dioxide(c) butane(d)carbon monoxideHide AnswerA

18 Q)The most malleable metal is

(a)Silver(b)Gold(c) Aluminium(d)SodiumHide AnswerB

19 Q)Tetraethyl lead is used as

(a) mosquito repellent(b)painkiller(c) fire extinguisher(d)petrol additiveHide AnswerD

20 Q)Which of the following is used in beauty parlours for hair setting?

(a) Chlorine(b)Sulphur(c) Phosphorus(d)SiliconHide AnswerB

21 Q)What type of reaction is carried out by the lipase in the digestion of fats?

(a) Reduction(b)Dehydration(c)Hydrolysis(d)CalcificationHide AnswerC

22 Q)"Assertion (A) Lithium is used in the light weight electrical batteries of the type found in clocks and watches. Reason (R) The mass of Li required to release 1 mole of electron is so small. "

(a)Both A and R are true and R is the correct explanation of A(b)Both A and R are true but R is not the correct explanation of A(c)A is true but R is false(d)A is false but R is trueHide AnswerA

23 Q)Which one of the following compounds is frequently found packed with drying tubes?

(a)Calcium sulphate(b)Magnesium chloride(c)Calcium chloride(d)Sodium thiosulphateHide AnswerC

24 Q)"Metal used to make wires for safety fuses must have "

(a) very low resistivity and high melting point(b) high resistivity and low melting point(c) low resistivity and low melting point(d) high resistivity and high melting pointHide AnswerB

25 Q)Which of the following is not a natural polymer?

(a)Wool(b) Silk(c) Cotton(d) TeflonHide AnswerD

26 Q)The ultra pure metal is obtained by

(a) calcination(b) sublimation(c) zone refining(d) None of theseHide AnswerC

27 Q)"Which one among the following polymers is used to make personal armour such as combat helmets, ballistic face masks, and ballistic vests?"

(a) Teflon(b) PVC(c) Bakelite(d) KevlarHide AnswerD

28 Q)"Assertion (A) A buffer solution is a mixture of a strong acid and its conjugate base or a strong base and its conjugate acid. Reason (R) Buffer solutions keep the pH at a nearly constant value."

(a)Both A and R are true and R is the correct explanation of A(b)Both A and R are true but R is not the correct explanation of A(c)A is true but R is false(d)A is false but R is trueHide AnswerD

29 Q)"Which of the following gases in the atmosphere is/are responsible for acid rains? I. Oxides of sulphur II. Oxides of nitrogen III. Oxides of carbon Select the correct answer using the codes given below"

(a) I and II(b) I and III(c) Only II(d) All of theseHide AnswerA

30 Q)Match the FollowingList lList II

(Elements)(Ores/Minerals)

A. Copper1. Corundum, Bauxite

B. Iron2. Malachite, Azurite

C. Lead3. Galena, Lanarkite

D. Aluminium4. Haematite,Limonite

(a) 2 4 3 1(b) 2 3 4 1(C) 4 3 1 2(d) 4 1 3 2Hide AnswerA

31 Q) Vermicompost is a/an

(a) inorganic fertilizer(b) toxic substance(c) organic bio fertilizer(d) synthetic fertilizerHide AnswerC

32 Q) Which one of the following is involved for desalination of sea water?

(a)Simple osmosis(b)Reverse osmosis(c)Use of sodium aluminium silicate as zeolite(d)Use of ion selective electrodeHide AnswerB

33 Q) "Soaps are important cleansing agent and this property is due to their emulsifying action. How does soap enhance the cleansing action? "

(a)It has a strong acidic character which can dissolve the dirt(b)It rises the temperature of the reaction(c)It breaks triple bond formed between dirt and cloth(d)It has capacity to render more prolonged the mixing of oil and waterHide AnswerD

34 Q) The animal fats undergo 'auto-oxidation' under ordinary temperature which gives the fats a rancid taste and odour. Which one of the following causes the rancid taste and odour of the fats?

(a) Platinum(b) Carbon monoxide(cj Carbon dioxide(d) AldehydesHide AnswerD

35 Q) "The pungent smell of garlic is due to "

(a)a phosphate compound(b)a nitrate compound(c)a sulphur compound(d)a chlorine compoundHide AnswerC

36 Q) Which one among the following statement about an atom is not correct?

(a) Atoms always combine to form molecule(b) Atoms are the basic units from which molecules and ions are formed(c) Atoms are always neutral in nature(d) Atoms aggregate in large numbers to from the matter that we can see, feel and touchHide AnswerD

37 Q) "The light emitted by firefly is due to "

(a)a radioactive substance(b)chemiluminiscence process(c)a photoelectric process(d)burning of phosphorusHide AnswerD

38 Q) Which one among the following metals is used in fireworks to make a brilliant white light?

(a) Sodium(b) Magnesium(c) Aluminium(d) SilverHide AnswerB

39 Q) "Consider the following statements.I.In the titration between weak bases and strong acids, the indicator such as methyl orange is commonly used.II.In the titration between a weak acid and a strong base, the indicator such as phenolphthalein is commonly used. Which of the statements given above is/are correct?"

(a)Only I(b) Only II(c) Both I and II(d) Neither I nor IIHide AnswerC

40 Q) Which one of the following reactions is responsible for the transformation of inexpensive liquid vegetable fats into commercially important solid fats (e.g. ghee)?

(a) Hydrogenation(b) Oxidation(c) Halogenation(d) SaponificationHide AnswerA

41 Q) Which one of the following is the softest?

(a) Sodium(b)Iron(c) Aluminium(d)CopperHide AnswerA

42 Q) Ethanol mixed petrol is being sold invarious states wef January 1, 2003. The percentage of ethanol in petrol is

(a) 10%(b) 7%(c) 6%(d) 5%Hide AnswerD

43 Q) A polymer which is used for making ropes and carpet fibres is

(a) polyacetylene(b) polypropylene(c) polyacrylonitrile(d) PVCHide AnswerB

44 Q) Which one among the following salts causes hardness to the water?.

(a)Calcium bicarbonate(b)Calcium carbonate(c)Sodium sulphate(d)Potassium chlorideHide AnswerA

45 Q) Why is the meat preserved in the brine solution is not spoil as quickly as fresh meat?

(a)The bacteria will fall victim to osmosis and shrivel up and die(b)The brine solution makes the meat acidic, so growth of bacteria is prevented(c)The brine solution is an unfavourable medium for the reproduction of bacteria(d)None of the aboveHide AnswerA

46 Q) Assertion (A) Phenol is used for the manufacture of bakelite.Reason (R) Bakelite is heat resistant thermosetting plastic used for making electric switches and switch board.

(a)Both A and R are true and R is the correct explanation of A(b)Both A and R are true but R is not the correct explanation of A(c)A is true but R is false(d)A is false but R is trueHide AnswerB

47 Q) "Consider the following statementsI. Washing soda is used as a water softener.II. Saltpeter is used for heat transfer in solar power plants.Which of the statements given above is/are correct?"

(a) Only I(b) Only II(c) Both I and II(d) Neither I nor IIHide AnswerC

48 Q) "Consider the following substances.I. CadmiumII. BoronIII. NickelWhich of the substances given above is/are used as controlling rod in nuclear reactor? "

(a) All of these(b) I and II(c) II and III(d) Only IIHide AnswerB

49 Q) "Assertion (A) In the alkali metals, potassium is the second lightest element in the group.Reason (R) Potassium imparts yellow colour to the flame."

(a)Both A and R are true and R is the correct explanation of A(b)Both A and R are true but R is not the correct explanation of A(c)A is true but R is false(d)A is false but R is trueHide AnswerC

50 Q) Consider the following statementsI. Jet fuel is a mixture of a large number of different hydrocarbons.II.Kerosene-type jet fuel (Jet A and Jet A-1) has a carbon number between 8 and 16.III.Naphtha-type jet fuel (including Jet B), has carbon numbers between 5 and 15. Which of the statements given above is/are correct?

(a)I, II and III(b) I and III(c) II and III(d) Only IIHide AnswerA

51 Q) "Which one of the following is used as a mordant in dyeing and tanning industry? "

(a) Magnesium oxide(b) Magnesium chloride(c) Magnesium sulphate(d) Magnesium carbonateHide AnswerC

52 Q) Which one of the following is the reason for keeping the chloroform in brown-tinted glass containers?

(a)Its brilliance colour hurts eyes(b)Its deep red colour is piercing(c)With UV-rays and 02, it forms poisonous gas phosgene(d)With IR-rays, it forms a poisonous cyanideHide AnswerC

53 Q) "Consider the following statementsI.Acid rain is caused by emission of carbon dioxide, sulphur dioxide and nitrogen oxides.II.The most important gas which leads to acidification is sulphur dioxide.Which of the statements given above is/are correct?"

(a)Only I(b)Only II(c) Both I and II(d) Neither I nor IIHide AnswerC

54 Q) "Consider the following statementsI.All the enzymes found in the organisms are protein in nature.II.Enzymes do not need any cofactor to perform their functions.Which of the statements given above is/are correct?. "

(a) Only I(b) Only II(c) Both I and II(d) Neither I nor IIHide AnswerA

55 Q) The flavour of apple is mainly due to which one of the following?

(a) Formalin(b) Ethanol(c) Benzene(d)BenzaldehydeHide AnswerB

56 Q) The ability of geckos which can hang on a glass surface using only one toe and to climb on sheer surfaces has been attributed to the

(a)hydrophobic interaction(b)van der Waals force(c)electrostatic interaction(d)covalent bondHide AnswerB

57 Q) KO2 (Potassium superoxide) is used in oxygen cylinders in space and submarines because it

(a)eliminates moisture(b)absorbs C02(c) produces ozone(d) produces C02Hide AnswerB

58 Q) "Consider the following statementsI. Mustard gas are a class of related cytotoxic and vesicant chemical warfare agents with the ability to form large blisters on the exposed skin and in the lungs.II. Mustard gas is the organic sulphur compound.Which of the statements given above is/are correct?"

(a) Only I(b) Only II(c) Both I and II(d) Neither I nor IIHide AnswerCp 59 Q) Which one among the following is the chief compound used in Pepper spray, a riot control agent?

(a) Capsaicin(b) Black pepper(c)Sulphur dioxide(d)Hydrogen sulphideHide AnswerA

60 Q) " Assertion (A) On mixing with water, plaster of Paris hardens.Reason (R) By combining with water, plaster of Paris is converted into gypsum."

(a)Both A and R are true and R is the correct explanation of A(b)Both A and R are true but R is not the correct explanation of A(c)A is true but R is false(d)A is false but R is trueHide AnswerA61 Q) "The bleaching action of chlorine occurs in the presence of "

(a) moisture(b) sunlight(c) pure oxygen(d) pure sulphur dioxideHide AnswerA

62 Q) Which one among the following polymers is re-synthesised from the naturally occurring polymer?

(a) Kevlar(b) Teflon(c) Rayon(d) CelluloseHide AnswerC

63 Q) Which one of the following chemicals released along with domestic wastes has caused the phenomenon of Eutrophication' which leads to high productivity of water bodies?

(a)Phosphates and nitrates(b)Sulphates and chlorides(c)Chlorides and carbonates(d)Bicarbonates and carbonatesHide AnswerA

64 Q) Which one of the following has been producing/can produce light by a chemical change?

(a) Electric bulb(b) Moon(c) Sun(d) Lightning and thunderHide AnswerC

65 Q) Which one of the following chemical compounds is responsible for the stimulation of tear glands by the onion?.

(a)A phosphate compound(b)A nitrate compound(c)A sulphide compound(d)A chloride compoundHide AnswerC

66 Q) "Many communities put salt on their roads after a snowfall, Why? "

(a)To enhance the freezing and hardening of snow(b)To control the slipping of vehicles(c)To keep the melted snow from refreezing(d)None of the aboveHide AnswerC

67 Q) "Assertion (A) All liquids are conductors of Electricity.Reason (R) Linder the condition of low pressure and high voltage, liquids can be made conducting."


68 Q) "Assertion (A) Apples have an anti-tumour action.Reason (R) The benzene compounds contain in the apple have a great medicinal value."


69 Q) "Consider the following statementsI.Glass wool has tensile strength greater than steel,II.Glass wool is fire powder.III.Glass wool has high electrical conductivity and absorbs moisture.IV.Glass wool is used to prepare fire glass.Which of the statements given above are correct?"

(a)I, II, III and IV(b) I, II and III(c) I, II and IV(d) III and IVHide AnswerC

70 Q) "Why hard water does not give lather with soap? "

(a) Hard water contains calcium and magnesium ions, which form precipitate with soap(b) Hard water contains sulphate and chloride ions, which form precipitate(c) pH of hard water is high(d) pH of hard water is lessHide AnswerD71 Q) The most abundant metal in the Earth's crust is

(a) Si(b) Fe(c) A1(d) CuHide AnswerC

72 Q) A pale blue gas with a fish-like odour restores the colour of a blackened lead painting. The gas is also used as rocket fuel. It is

(a)oxygen(b)ammonia(c) sulphur dioxide(d) ozoneHide AnswerB

73 Q) Which one of the following is used to slow down the speed of the neutrons in the nuclear reactor?.

(a)Controlling rod(b) Moderator(b)Coolant(d) AcceleratorHide AnswerB

74 Q) "Assertion (A) During setting of cement, the structure has to be cooled by spraying water.Reason (R) The constituents of the cement undergo hydration during setting of cement and it is an exothermic reaction."


75 Q) "Which one among the following substances evolved heat when dissolved in water? "

(a) Glucose(b) Fructose(c) Quick lime(d) Salt peterHide AnswerC

76 Q) Which one of the following is correct? Butter is?

(a)a supercooled oil(b) an emulsion(c) a molecular solid(d) a gelHide AnswerD

77 Q) "Consider the following statementsI.Photochromic lenses are lenses that darken on exposure to ultraviolet light.II.Photochromic properties is due to embedded microcrystalline of silver chloride in the glass.Which of the statements given above is/are correct?."

(a)Only I(b) Only II(c)Both I and II(d) Neither I nor IIHide AnswerC

78 Q) Match the FollowingList 1 (Names)List II (Compounds)

A. Baking soda1. Sodium nitrate

B. Washing soda2. Calcium hydroxide

C. Chile saltpeter3. Sodium carbonate

D. Slack lime4. Sodium bicarbonate

(a) 2 4 3 1(b) 2 3 4 1(c) 4 3 1 2(d) 4 1 3 2Hide AnswerC

79 Q) "Assertion (A) Atomic hydrogen is stronger reducing agent than nascent hydrogen.Reason (R) Atomic hydrogen is obtained by thermal decomposition of molecular hydrogen."


80 Q) The rusting of iron nail

(a)decreases it weight(b)increases its weight(cj does not affect weight but iron is oxidised(d)does not affect weight but iron is reducedHide AnswerB81 Q) Which one of the following pollutants contains in water due to modern agricultural practices lead to 'methemoglobinaemia' when combines with our blood haemoglobin?

(a)Bicarbonates(b)Sulphates(c) Phosphates(d)NitratesHide AnswerD

82 Q) "What is the role of positive catalyst in a chemical reaction? "

(a)It increases the rate of reaction(b)It decreases the rate of reaction(c)It increases the yield of the products(d) It provides better purity of the productsHide AnswerC

83 Q) The pH of fresh groundwater slightly decreases upon exposure to air because

(a) carbon dioxide from air is dissolved in the water(b) oxygen from air is dissolved in the water(c) the dissolved carbon dioxide of the groundwater escapes into air(d) the dissolved oxygen of the groundwater escapes into airHide AnswerA

84 Q) "Consider the following statementsI.Brent Crude is a major trading classification of sweet light crude oil.II.Brent Crude is sourced from the North Sea.III.Brent Crude contains sulphur.Which of the statements given above are correct?."

(a) I, II and III(b) I and II(c) I and III(d) II and IIIHide AnswerA

85 Q) Which one of the following carbohydrates is used for silvering of mirror?

(a) Sucrose(b) Maltose(c)Fructose(d) GlucoseHide AnswerD

86 Q) Which bioinsecticide was first developed on commercial scale?

(a) Morphine(b) Quinine(c) DDT(d) SporeineHide AnswerD

87 Q) Which one among the following will you put into pure water in order to pass electric current through it?

(a) Kerosene(b) Mustard oil(c) Sugar(d) Lemon juiceHide AnswerD

88 Q) What is Agent orange?

(a)An insecticide(b) A weedicide(c) A fertilizer(d) A biofertilizerHide AnswerB

89 Q) "Consider the following statementsI.One water molecule forms four H-bonds.II.Water has high boiling point due to high dipole moment.III.When ice is melt, collapse of structure leads to increase in density.Which of the statements given above is/are correct?"

(a)I, II and III(b) I and III(c) II and III(d) II onlyHide AnswerA

90 Q) "Select the correct answer about ""Ajinomoto""I. It is a tasty powder and makes a great difference to the way of food taste.II. Chemically, it is monosodium glutamate.III. It causes the kwoks disease"" in man.Which of the following statements given above is/are correct?"

(a) Only I(b) Only II(c) I, II and III(d) II and IIIHide AnswerC

91 Q) "Consider the following statementsI.A chalcogenide glass is a glass containing sulphur, selenium or tellurium.II.Chalcogenide glass form the basis of re-writable CD and DVD solid-state memory technology. Which of the statements given above is/are correct?"


92 Q) Match the FollowingList 1List II

(Elements)(Colour on flame)

A. Barium1. Yellow

B. Sodium2. Greenish

C. Silver3. Turns black

D. Lead Codes4. Apple green

(a) 2 4 3 1(b) 2 3 4 1(c) 4 3 1 2(d) 4 1 3 2Hide AnswerD

93 Q) "Which of the following is correct for the semiconductor? "

(a) A large gap between filled band and vacant band(b) An impurity band present between filled band and vacant band.(c) A small gap between filled band and vacant band.(d) Filled band and vacant band overlap with one anotherHide AnswerB

94 Q) Making of chappathi is based on

(a) Graham's law(b) Henry's law(c) Charles' law(d) Boyle's lawHide AnswerC

95 Q) The hair dye available in the market contains two bottles, one containing dye and other containing hydrogen peroxide. The bottles are mixed before applying the dye. The function of hydrogen peroxide is

(a)to dilute the dye(b)to oxidise the dye to give desired colour(c)to reduce the dye to give desired colour(d)to acidify the dye solutionHide AnswerB

96 Q) Which one of the following pairs of metals is present in the cytochrome-c and chlorophyll respectively?.

(a)Fe and Zn(b)Mg and Mn(c) Fe and Mg(d)Mg and ZnHide AnswerC

97 Q) "Consider the following statementsI. Rust is formed by the reaction of iron and oxygen in the presence of water or air moisture.II. In salt water, iron tends to rust more quickly.Which of the statements given above is/are correct?"


98 Q) The coil in a heater is made of

(a) nichrome(b) tungsten(c) copper(d) ironHide AnswerA

99 Q) " Assertion (A) Thorium is an efficient nuclear fuel widely used throughout the world.Reason (R) India is richly endowed with thorium mineral."


100 Q) From which one among the following water source, the water is likely to be contaminated with fluorine?

(a) Ground water(b) Rain water(c) River water(d) Pond waterHide AnswerC

101 Q) In terms of magnetic properties oxygen belongs to

(a) magnetic material(b) ferromagnetic materials(c) paramagnetic materials(d) diamagnetic materialsHide AnswerC

102 Q) "Consider the following statementsI.Alums are the double salts of sulphates of monovalent and divalent cations.II.Alum is used in the purification of drinking water.Which of the statements given above is/are correct?"

(a) Only I(b)Only II(c) Both I and II(d) Neither I nor IIHide AnswerB

103 Q) The pure form of carbon is

(a) diamond(b) graphite(c) charcoal(d) fullereneHide AnswerA

104 Q) Which one of the following reducing agents can also act as an oxidising agent?

(a)Hydrogen chloricd(b)Hydrogen iodide(c)Hydrogen sulphide(d)Sulphur dioxideHide AnswerD

105 Q) The polymeric fibre used as a substitute for wool in making synthetic blankets, sweater, etc., is

(a) nylon(b) teflon(c) orlon(d) bakeliteHide AnswerC

106 Q) "A body is charged negatively. It implies that "

(a) it has lost some of its protons(b) it has lost some of its electrons(c) it has gained some electrons from outside(d) None of the aboveHide AnswerC

107 Q) Which one among the following polymers is used for making bullet-proof material?

(a) Polyvinyl chloride(b) Polystyrene(c) Polyethylene(d) PolyamideHide AnswerC

108 Q) Which one of the following is not responsible for the global warming?

(a) Carbon dioxide(b) Methane(c) CFCs(d)Slacked limeHide AnswerA

109 Q) The Fehlling's solution is used for the detection of

(a) glucose(b) starch(c) lipids(d) proteinsHide AnswerA

110 Q) Shallow lake with rich organic products are called

(a) heterotrophic(b) eutrophic(c) mesotrophic(d) oligotrophicHide AnswerB111 Q) A person is weak, sterile and has very poor eyesight. These are the symptoms because of a pollutant

(a) copper(b)mercury(c) magnesium(d) leadHide AnswerA

112 Q) In modern days, which one of the following chemical compounds is used for the hair setting in beauty parlour/ salon?

(a) A phosphate compound(b) A sulphur compound(c) A magnesium compound(d) A bicarbonate compoundHide AnswerB

113 Q) "The gas used in a refrigerator is "

(a)cooled down on flowing(b)heated up on flowing(c)cooled down when compressed(d)cooled down when expandedHide AnswerD

114 Q) Which one of the following is not an ore?

(a) Bauxite(b) Pig iron(c) Malachite(d) Zinc blendeHide AnswerB

115 Q) Which one of the following is used to measure the performance of a motor or gasoline, an aviation fuel?

(a) Iodine number(b) Octane number(c) Both 'a' and 'b'(d) Neither 'a' nor 'b'Hide AnswerB

116 Q) The number of spectral lines when electron jumps from 5th energy level to 2nd energy level state will be

(a) 5(b) 10(c) 6(d)15Hide AnswerC

117 Q) Match the FollowingList 1 (Polymers)List II (Monomers)

A. Nylon-61. para-phenylenediamine + Terephthaloyl chloride

B. Kevlar2. Caprolactum

C. Nylon-663. Hexamethylene diamine + Adipic acid

D. Bakelite4. Phenol + Formaldehyde

(a) 2 1 3 4(b) 2 3 4 1(c) 3 4 2 1(d) 3 1 2 4Hide AnswerA

118 Q) Which one of the following is the metallurgical operation in which a metal is obtained in a fused state?

(a) Calcination(b)Roasting(c) Froth floatation(d)SmeltingHide AnswerD

119 Q) "What is the role of positive catalyst in chemical reaction? "

(a) It increase the rate of reaction(b) It decrease the rate of reaction(c) It increases the yield of the products(d) It provides better purity of the productsHide AnswerD

120 Q) "Consider the following statements. Loss of beta- particle is equivalent toI.increase in one proton only.II.decrease in one neutron only.Which of the statements given above is/are correct?"

(a) Only I(b) Only II(c)Both I and II(d) Neither I nor IIHide AnswerC121 Q) Which one of the following oxides is the most abundant in Earth crust?

(a) Na2O(b) CaO(c) MgO(d) SiO2Hide AnswerD

122 Q) "Natural Opal which is commonly used as gemstones in many countries is mainly "

(a)a hydrated calcium compound(b)a magnesium compound(c) a sulphur compound(d)a hydrated silicaHide AnswerD

123 Q) Sacrificial anode protects Iron or ships, underground pipelines etc. from rusting, a process known as cathodic protection. Which one of the following metals cannot be used as a sacrificial anode?

(a) Tin(b) Aluminium(c) Zinc(d) MagnesiumHide AnswerA

124 Q) Which one among the following chemicals can be used to clean the surface of gold ornaments?

(a) Concentrated sulphuric acid(b) Concentrated sodium hydroxide(c) Aqua-regia(d) Sodium thiosulphate solutionHide AnswerC

125 Q) Which one among the following statements is correct?

(a) All bases are alkalis(b) None of the basis is alkali(c) There are no more bases except the alkalis(d) All alkalis are bases but all bases are not alkalisHide AnswerD

126 Q) "Which chemical was an important symbol in our struggle for freedom?."

(a) Glucose(b)Fertilizer(c) Medicine(d)Sodium chlorideHide AnswerD

127 Q) Which one of the following is the hardest alkali metal?

(a) Li(b) K(c) Na(d) CsHide AnswerA

128 Q) Scuba divers are at high risk due to high concentration of dissolved gases while breathing air at high pressure under water. The tanks used by Scuba divers are filled with

(a) air diluted with helium(b) 02(c) N2(d) a mixture of nitrogen and heliumHide AnswerA

129 Q) "Carbonated beverages such as soft drinks and soda water contains mainly "

(a) carbon dioxide(b) calcium carbonate(c) calcium hydroxide(d) potassium carbonateHide AnswerA

130 Q) "Consider the following statementsI.The Carat is a unit of purity for gold alloys.II.18-Carat gold is 24 parts gold and 6 parts another metal.Which of the statements given above is/are correct?"

(a) Only I(b) Only II(c) Both I and II(d) Neither I nor IIHide AnswerA131 Q) "Which one of the following is correct? Setting of plaster of Paris is "

(a)dehydration(b)oxidation with atmospheric oxygen(c)hydration leading to another hydrate(d)combination with atmospheric carbon dioxideHide AnswerD

132 Q) At the very low temperature, ice forms

(a)tetrahedral crystal(b)cubic crystal(c)hexagonal crystal(d)None of the aboveHide AnswerB

133 Q) Food wrapped in newspaper is likely to get contaminated with

(a) aluminium(b) lead(c) iron(d) magnesiumHide AnswerB

134 Q) "Consider the following statementsI.Dry ice is the solid form of CO2.II.Dry ice is used primarily as a cooling agent.III.Water ice is colder than dry ice.Which of the statements given above is/are correct?"

(a) Only I(b) Only II(c) I and II(d) I, II and IIIHide AnswerC

135 Q) " Assertion (A) Nitric acid is used in the production of fertilizers.Reason (R) Sulphuric acid is used in the production of explosive."


136 Q) "With reference to the usefulness of the by-products of sugar industry, which of the following statements is/are correct?1. Bagasse can be used as biomass fuel for the generation of energy.2.Molasses can be used as one of the feedstocks for the production of synthetic chemical fertilizers.]3. Molasses can be used for the production of ethanol.Select the correct answer using the codes given below."

(a) Only 1(b) 2 and 3(c) 1 and 3(d) 1, 2 and 3Hide AnswerC

137 Q) The bonding between the nitrogenous bases of one strand with another strand of DNA is done by

(a)covalent bond(b)van der Waals' interaction(c)hydrogen bond(d) ionic bondHide AnswerC

138 Q) Which one among the following when dissolved in water give hissing sound?

(a) Limestone(b)Sodalime(c) Slaked lime(d)Quick limeHide AnswerD

139 Q) Which one among the following would expand the most on being heated?

(a) Water(b) Air(c) Alcohol(d) GlassHide AnswerB

140 Q) If a limestone piece is dipped in water, bubbles evolve. The bubbling is due to

(a) hydrogen(b)oxygen(c) water vapour(d)carbon dioxideHide AnswerD141 Q)If four balloons A, B, C and D are filled with hydrogen, oxygen, helium and nitrogen gases respectively and left in air, which balloon reaches to the highest distance from the Earth?.

(a) Balloon A(b) Balloon B(c) Balloon C(d) Balloon DHide AnswerB

142 Q)" Assertion (A) Methane is one of the major GHGs.Reason (R) Methane has more potential for global warming than carbon dioxide."


143 Q)Commercially vulcanisation of rubber involves

(a) sulphur(b)carbon(c) phosphorus(d)seleniumHide AnswerA

144 Q)"Consider the following substancesI. Heavy WaterII. GraphiteWhich of the substances given above is/are used as a moderator in a nuclear reactor? "


145 Q)Which one of the following is used in the preparation of antiseptic solution?

(a)Potassium nitrate(b)Iodine(c)Iodine chloride(d)Potassium chlorideHide AnswerB

146 Q)Which one of the following enzyme is used to digest gelatine in the process of recovering silver from the photographic film?

(a) Amylase(b) Pepsin(c) lipase(d) None of theseHide AnswerB

147 Q)Contact lenses are made from

(a) polyvinyl chloride(b) polystyrene(c) Teflon(d) luciteHide AnswerD

148 Q)"Now does the 'hypo' used in photography? "

(a)It acts as a strong reducing agent(b)It acts as a strong oxidising agent(c)It removes unreacted AgBr in the form of complex(d)All of the aboveHide AnswerC

149 Q)When the fats are reacted with alkali, they form soaps. The type of reaction taking place in the formation of soaps is called

(a) emulsification(b) saponification(c) halogenation(d) oxidationHide AnswerB

150 Q)The biological specimens in laboratory are preserved in the glass containing formalin. What is the "formalin''?

(a)An aqueous solution of H2S04(b)An aqueous solution of HNOa(c)An aqueous solution of formaldehyde(d)Concentrated solution of HNOaHide AnswerC

151 Q)Which one of the following is the major component of the photochemical smog'?

(a) Carbon dioxide(b) Ozone(c)Carbon monoxide(d)NitrogenHide AnswerB

152 Q)As which one of the following, does carbon occur in its purest form in nature?

(a) Diamond(b) Graphite(c) Carbon black(d) CoalHide AnswerC

153 Q)"The pH of fresh groundwater slightly decreases upon exposure to air because "

(a) carbon dioxide from air is dissolved in the water(b) oxygen from air is dissolved in the water(c) the dissolved carbon dioxide of the groundwater escapes into air(d) the dissolved oxygen of the groundwater escapes into airHide AnswerA

154 Q)Which of the following pesticide is applied to the foundation of buildings to prevent termites?

(a) Aldrin(b)Malathion(c) Atrazine(d)CarbarylHide AnswerA

155 Q)Which of the following pairs of chemical compounds has the potential for carbon capturing by chemical process to reduce the global warming?

(a)Potassium oxide and sodium oxide(b)Magnesium oxide and calcium oxide(c)Magnesium oxide and potassium oxide(d)Calcium oxide and potassium oxideHide AnswerB

156 Q)"Consider the following statements.I.Probability of finding the electron in the bonding molecular orbital is more than combining atomic orbitals.II.Bonding molecular orbitals are formed when different sign of orbitals are overlapped. .Which of the statements given above is/are correct?"

(a) Only I(b) Only II(c) Both I and II(d) Neither I nor IIHide AnswerA

157 Q)Which one of the following chemicals is commonly used by farmers to destroy weeds?

(a) Malathion(b) DDT(c) 2,4-D(d) Methyl bromideHide AnswerC

158 Q)The highest temperature can be achieved in which type of furnace?

(a) Blast(b) Reverberatory(c) Electric(d) None of theseHide AnswerC

159 Q)Which one among the following is the natural polymer?

(a)Nylon(b) Teflon(c) PVC(d) CelluloseHide AnswerD

160 Q)"Silicon carbide (SiC) is known as "

(a) quartz(b) tridynite(c) corundum(d) carborundumHide AnswerC161 Q)Vinegar is used as a condiment, and in the pickling of vegetables and other foods. What is the constituent of vinegar?

(a)Butanoic acid(b) Methanoic acid(c) Ethanoic acid(d) Hexanoic acidHide AnswerC

162 Q)Which one of the following is used to measure the combustion quality of diesel fuel during compression ignition?

(a)Octane number(b) Cetane number(c) Iodine number(d) Polenske numberHide AnswerB

163 Q)"Consider the following statementsI.Sodium thiosulphate is used in both film and photographic paper processing.II.Sodium thiosulphate is used as an antidote to cyanide poisoning.Which of the statements given above is/are correct?"

(a) Only I(b) Only II(c)Both I and II(d) Neither I nor IIHide AnswerC

164 Q)"Assertion (A) Potassium ion is an essential nutrients for plants.Reason (R) The usual form of potassium fertilizers is KCI. "


165 Q)" Assertion (A) The nuclear fusion reaction releases less energy than the fission reaction.Reason (R) The nuclear fusion reaction takes place in the sun and other stars."


166 Q)One of the occupational health hazards commonly faced by the workers of ceramic, pottery or glass industries is

(a) stone formation in gall bladder(b) melanoma(c) stone formation in kidney(d) silicosisHide AnswerD

167 Q)Which one of the following glasses form the basis of re writable CD and DVD solid-state memory technology?

(a) Recycled glass(b)Borosilicate glasses(c) Chalcogenide glasses(d) Pyrex glassesHide AnswerC

168 Q)What is the purpose of adding baking soda to dough?.

(a)To generate moisture(b)To give a good flavour(c)To give a good colour(d)To generate carbon dioxideHide AnswerD

169 Q)"Consider the following statementsI. Crude oil is separated into fractions by steam distillation.II. The fractions at the top of the fractionating column have lower boiling points than the fractions at the bottom.III. Lubricating oils, Paraffin wax, Asphalt and tar are boiled at around 400 C.Which of the statements given above is/are correct?"

(a) I, II and III(b) I and III(c) II and III(d) Only IIIHide AnswerC

170 Q)"Liquid sodium is used for the heat transfer medium in some of nuclear reactor because "

(a)sodium has high rate of vapourisation(b)sodium has low density and high viscosity(c)sodium has high specific heat than the most liquid metals(d)All of the aboveHide AnswerC171 Q)"Consider the following substancesI. Toilet soapII. ToothpasteIII. VinegarIV. Baking sodaWhich of the substances given above is/are mixture in nature?"

(a) I, II, III and IV(b) I, II and III(c) I and III(d) III and IVHide AnswerB

172 Q)Gold is mainly extracted by

(a) carbon reduction(b) self reduction(c) electrolytic method(d) Arndt forrest cyanide methodHide AnswerD

173 Q)"Consider the following statementsI.Cloud seeding is an attempt to change the amount of precipitation.II.The most common chemicals used for cloud seeding include silver iodide, dry ice and liquid propane.Which of the statements given above is/are correct?"


174 Q)"Consider the following statementsI. Generally, diesel engines operate well with a cetane number from 40 to 55.II. Alkyl nitrates (principally 2-ethyl hexyl nitrate) and di-tert-butyl peroxide are used as additives to raise the cetane number.Which of the statements given above is/are correct?"


175 Q)Which one of the following petroleum refinery products has the lowest boiling point?

(a) Kerosene(b) Gasoline(c) Diesel(d) Lubricating oilHide AnswerB

176 Q)Which one of the following is an element?

(a)Topaz(b) Diamond(c) Ruby(d) SapphireHide AnswerB

177 Q)The bond which is present between water molecules is

(a) electrovalent bond(b) covalent bond(c)hydrogen bond(d)van der Waals' bondHide AnswerC

178 Q)Which one among the following agents is added to domestic LPG cylinder to help in the detection of gas leakage?

(a) Methano(b)Ethanol(c) Thioethanol(d)ChloroformHide AnswerC

179 Q)Which allotropy of carbon is in rigid three-demensional structure?

(a) Graphite(b)Fullerene(c) Diamond(d)Carbon blackHide AnswerC

180 Q)Guncotton is used as a propellant or low-order explosive. Chemically the gun cotton is

(a)potassium hydroxide(b)cellulose sulphate(c)cellulose nitrate(d)calcium phosphateHide AnswerC

181 Q)"To meet its rapidly growing energy demand, some opine that India should pursue research and development on thorium as the future fuel of nuclear energy. In this context, what advantage does thorium hold over uranium?1. Thorium is far more abudant in nature than uranium2. On the basis of per unit mass of mined mineral, thorium can generate more energy compared to natural uranium.3. Thorium produces less harmful waste compared to uranium.Which of the statement (s) given above is/are correct?"

(a) Only 1(b) 2 and 3 (c) 1 and 3(d) 1, 2 and 3 Hide AnswerD

182 Q) "Consider the following gasesI. Water vapourII. Nitrous oxideIII. CFCIV. MethaneWhich of the gases given above are Green House Gases (GHGs)? "

(a) All of these (b) I, II and III (c) II and III(d) II and IV Hide AnswerA

183 Q) Which one of the following compounds was responsible for the epidemic form of disease called'Minamata Disease'?

(a)A lead compound (b)A mercury compound (c)A sulphur compound (d)A fluorine compound Hide AnswerB

184 Q) Statement I Chlorine radicals C1 initiate the chain reaction for ozone depletion. Statement II Gaseous hypochlorous acid and chlorine are photolysed by sunlight.

a. Both the statements are true and Statement II is the correct explanation of Statement I. b. Both the statements are true, but Statement II is not the correct explanation of Statement I. c. Statement I is true, but Statement II is false. d. Statement I is false, but Statement II is true. Hide AnswerA

185 Q) Match the FollowingList IList II

A. Haemoglobin1. Anti-cancer agent

B. Chlorophyll2. Complex of cobalt

C. Vitamin-B,23. Complex of magnesium

D. C/'s-platin4. Complex of iron

(a) 2 4 3 1 (b) 2 1 4 3 (c) 4 3 2 1 (d) 4 1 2 3 Hide AnswerC

186 Q) Which one among the following polymers is used for making bullet-proof material?

(a) Polyvinyl chloride(b) Polystyrene (c) Polyethylene(d) Polyamide Hide AnswerC

187 Q) "Which one of the following fatty acids consists only the essential fatty acids? "

(a) Stearic acid, linolenic acid, arachidonic acid (b) Linoleic acid, oleic acid, linolenic acid (c) Linoleic acid, linolenic acid, arachidonic acid (d) Linoleic acid, linolenic acid, stearic acid Hide AnswerC

188 Q) Which one among the following statement about an atom is not correct?

(a) Atoms always combine to form molecule (b) Atoms are the basic units from which molecules and ions are formed (c) Atoms are always neutral in nature (d) Atoms aggregate in large numbers to from the matter that we can see, feel and touch Hide AnswerD

189 Q) Sodium stearate is a salt and is used

(a) in gun powder(b) in paint (c) to make soap(d) to make fertilizer Hide AnswerC

190 Q) "Freon' used as refrigerants is chemically known as "

(a)fluorinated aromatic compound (b)fluorinated hydrocarbon (c)chlorinated hydrocarbon (d)chlorofluoro hydrocarbon Hide AnswerD

191 Q) "Consider the following statementsI.Fuels with low octane numbers are ideal for diesel engines.II.Use of gasoline with low octane numbers may lead to the problem of engine knocking.Which of the statements given above is/are correct?"

(a) Only I(b) Only II(cj Both I and II(d) Neither I nor IIHide AnswerC

192 Q) "Two atoms are said to be isotopes if "

(a)they have the same atomic number, but different mass numbers(b)they have the same number of neutrons, but different mass numbers(c)the sum of the number of protons and neutron is the same, but the number of protons is different(d)they have the same number of neutrons, but different modes of radioactive decayHide AnswerA

193 Q) "Consider the following statementsI.Phosgene is a poisonous compound forms from chloroform in the presence of UV-rays and 02.II.It is used for the synthesis of precursor for the poly-urethane polymer. Which of the statements given above is/are correct?"


194 Q) Which one among the following is not a periodic property i.e., does not show any trend on moving from one side to the other in the Periodic Table?

(a) Atomic size(b) Radioactivity(c) Valency(d) ElectronegativityHide AnswerB

195 Q) "Consider the following statementsI.Hard soaps (common bar soaps) are the sodium salts of fatty acids.II.Soft soaps are the potassium salts of fatty acids and semi-solid in nature.Which of the statements given above is/are correct?"


196 Q) Which of the following is used in the industrial manufacture of Vitamin-A?.

(a) Na2C2(b) Li2C2(c) C60K(d) LiC2HHide AnswerD

197 Q) Which one of the following is used as an anti-freezer, which effectively depresses the freezing point of water in an automobile?.

(a)Ethylene glycol(b) Propanoic acid(c) Glutamic acid(d) Glycolic acidHide AnswerA

198 Q) "Aqua-regia used by alchemist to separate silver and gold is a mixture of "

(a)concentrated HNO, and concentrated h2so4(b)concentrated HC1 and concentrated h2so4(c)concentrated HN03 and concentrated HC1(d)dilute HN03 and dilute HC1Hide AnswerC

199 Q) "Why hard water does not give lather with soap?. "

(a)Hard water contains calcium and magnesium ions which form precipitate with soap.(b)Hard water contains sulphate and chloride ions which form precipitate.(c)pH of hard water is high.(d)pH of hard water is less.Hide AnswerA

200 Q) "Consider the following statementsI.Pyrex glasses have boron oxide as main cor.otituent besides silica.II.Pyrex glasses have high thermal expansion, thus less vulnerable to cracking from thermal shock.III.They are commonly used for reagent bottles, optical components and household cookware.Which of the statements given above is/are correct?"

(a) I, II and III(b) I and III(cj II and III(d) Only IIHide AnswerB

201 Q) Which one among the following metals is used in fireworks to make a brilliant white ligh

(a) Sodium(b)Magnesium(c) Aluminium(d)SilverHide AnswerB

202 Q) Match the Following(Item)(Toxic substance)

A. CFL lamp1. Nitrogen oxide

B. Automobile battery2. Phthalates

C. Polymer3. Lead

D. Diesel engine4. Mercury

(a) 2 4 3 1(b) 2 3 4 1(c) 4 3 2 1(d) 4 2 3 1Hide AnswerC

203 Q) "Consider the following statementsI. CFLs have a life expectancy of 10000 hrs if used 3 hrs per day.II.CFLs help in reducing global warming.III.CFLs contain mercury which is very harmful to living beings.IV. CFLs should be disposed of properly and recycled.Which of the statements given above are correct?"

(a) I, II, III and IV(b) I, II and III(c) II, III and IV(d) III and IVHide AnswerA

204 Q) The quality of diesel oil for use in diesel engines is determined by the

(a)composition of the oil(b)octane number(c)cetane number(d)amount of additives addedHide AnswerC

205 Q) Which of the following proteins has structural as well as enzymatic property?

(a) Collagen(b) Actin(c) Dynein(d) NexinHide AnswerB

206 Q) "Consider the following compounds with the reference to constituent of dettolI. ChloroxylenolII. TerpineolWhich of the compounds given above is/are correct?"


207 Q) Which one of the following is the important ore of magnesium?

(a) Cassiterite(b)Malachite(c) Camalite(d)GalenaHide AnswerC

208 Q) The elements of a group in the periodic table

(a) have similar chemical properties(b) have consecutive atomic numbers(c) are isobars(d) are isotopesHide AnswerA

209 Q) Nail polish remover contains

(a) benzene(b)formaldehyde(c) acetic acid(d)acetoneHide AnswerD

210 Q) Misch metal is widely used in the manufacture of which of the following?

(a)Material of car break(b)Smoke detectors(c)Cigarette lighter(d)Emergency lighterHide AnswerC

211 Q) "Assertion (A) The natural rubber is the polymer of m-isoprene.Reason (R) Poly-rram-isoprene is called Gutta-percha."


212 Q) In the modern food processing industries, the foodstuffs are found to be preserved in the brine solution. What is the brine solution?

(a)Saturated solution of MgCl2(b)Saturated solution of carbonic acid(c)Saturated solution of NaCl(d)Saturated solution of FeCl3Hide AnswerC

213 Q) Which one of the following is associated with the formation of brown air in traffic congested cities?

(a)Sulphur dioxide(b) Nitrogen oxide(c)Carbon dioxide(d)Carbon monoxideHide AnswerB

214 Q) What is the process by which a lipid mass is converted into a number of small droplets?

(a) Saponification(b)Emulsification(c) Oxidation(d)DehydrogenationHide AnswerB

215 Q) Which one of the following alkali metals is the lightest?

(a) Na(b) Cs(c) K(d) RbHide AnswerC

216 Q) "Which one of the following consists only the ores of magnesium? "

(a) Magnesite, carnallite, cassiterite, dolomite, epsom salt(b) Magnesite, carnallite, dolomite, kieserite, epsom salt(c) Magnesite, carnallite, dolomite, galena, malachite(d) Magnesite, cassiterite, kieserite, galena, malachiteHide AnswerB

217 Q) " Assertion (A) A covalent bond is formed by the sharing of pairs of electrons between atoms.Reason (R) Covalency is greatest between atoms of different electronegativities."


218 Q) What is called as Jeweller's rouge?

(a) Ferric carbonate(b)Ferrous carbonate(c) Ferrous oxide(d) Ferric oxideHide AnswerD

219 Q) Which one among the following metal ions is essential for erythropoesis in human beings?

(a) Ca2+ ion(b) Mg2+ ion(c) Cu2+ ion(d) Fe2+ ionHide AnswerD

220 Q) "Which of the following gases in the atmosphere is/are responsible for acid rains?.1.Oxides of sulphur2.Oxides of nitrogen3.Oxides of carbonSelect the correct answer using the codes given below"

(a)1 and 2(b) 1 and 3(c) Only 2(d) 1, 2 and 3Hide AnswerA

221 Q) "The role of the calcinations in metallurgical process is "

(a) to remove moisture(b) to decompose carbonate into oxide(c) to remove organic matter(d) All of the aboveHide AnswerD

222 Q) "Colligative properties are properties of solutions that depend on "

(a)the mass of the molecules present in the solution(b)the size of the molecules present in the solution.(c)the number of ions/molecules in a given amount of solvent(d)None of the aboveHide AnswerC

223 Q) "Which of the following statements in connection with the properties of water is/are correct?1 .Water has higher specific heat in comparison with other liquid.2.Water has no dipole moment.3.Water has low heat of vaporisation.Select the correct answer using the codes given below"

(a) Only 1(b) 2 and 3(c) 1 and 3(d) Only 3Hide AnswerA

224 Q) Which one among the following is the commonest amino acid in nature?

(a) Glycine(b) Alanine(c) Phenylalanine(d) Aspartic acidHide AnswerB

225 Q) The melting points and boiling points of the transition elements are higher than the corresponding s-block elements. Then which one among the following statements is correct?

(a) Transition elements have smaller size(b) Presence of one or more unpaired electrons contributing to higher atomic forces on account of covalent bond(c) Presence of strong metallic bond due to small size and higher ionisation energy(d) Presence of vacant d-orbitalHide AnswerB

226 Q) Milk, Mayonnaise are the examples of

(a) sol(b) gel(c) emulsion(d) foamHide AnswerC

227 Q) Which one among the following is not a greenhouse gas?.

(a)Methane(b)Ozone(c)Chlorofluorocarbon(d)Sulphur dioxideHide AnswerB

228 Q) "Which one among the following statements is correct? "

(a) All bases are alkalis(b) None of the basis is alkali(c) There are no more bases except the alkalis(d) All alkalis are bases but all bases are not alkalisHide AnswerD

229 Q) "Consider the following statementsI.Hardness of water depends upon its soap consuming power.II.Temporary hardness is due to bicarbonates of magnesium and calcium.III.Permanent hardness of water is due to sulphate and/or chloride of calcium and magnesium.IV. Permanent hardness can be removed by boiling.Which of the statements given above are correct?"

(a) I, II, III and IV(b) I, II and III(c)II and III(d) III and IVHide AnswerA

230 Q) "Which of the following statements regarding the property of hard water is/are correct?.1.Temporary hardness of water is due to the presence of soluble magnesium and calcium hydrogen carbonate.2.Temporary hardness of water can be removed by boiling.3.Calgon's method is applied to remove temporary hardness of water.4.Permanent hardness of water is removed by Clarks method.Select the correct answer using the codes given below"

(a) 1 and 2(b) 1, 2 and 3(c) 3 and 4(d) Only 2Hide AnswerB

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