Chemistry MCQs Test Handouts

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Prepared by Osama Hasan (Chemistry Instructor and Coordinator NSTC-6 Preparation Programme) for students of Aga Khan Higher Secondary School, Karachi.Could be beneficial for entry test examinations.

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<p>CHEMICAL LANGUAGE</p> <p>CHEMISTRY TESTNSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>TEST O TOPIC</p> <p>STC PREPARATIO PROGRAMME : 1A DURATIO : CHEMICAL LA GUAGE PREPARED BY</p> <p>: 45 MI . : OSAMA HASAD) 30g</p> <p>1. What is the weight of oxygen which occupies 21 litres at S.T.P? A) 45 g B) 50 g C) 60g</p> <p>2. A gaseous mixture contains oxygen and nitrogen in the ratio of 1:4 by wt. Therefore the ratio of their number of molecules is? A) 1:4 B) 2:7 C) 7:32 D) 3:16 3. The largest number of molecules is in? A) 36g H2O B) 28g CO C) 46 g C2H5OH D) 54g NO5 4. 1.12 litre of oxygen at .T.P contains 3x1022 molecules. The volume SO2 at .T.P which will contain the same number of molecules? A) 22.4 l B) 1.12 l C) 0.56 l D) 4.44 l 5. Which of the following contains same no. of atoms as 6g of Mg? A) 12 g of carbon B) 4 g of oxygen C) 6 g of O3 D) 27 g of Al</p> <p>6. 2.4 g of a gaseous compound having same volume as that of 0.4 g of ethane gas. The mol. Wt. of gaseous compound is? A) 180 B) 240 C) 120 D) None 7. The volume occupied by 2g of Helium at S.T.P is? A) 5.6 litres B) 2.8 litres C) 11.2 litres 8. What volume occupied by 14g of 2 at S.T.P? A) 22.5 litres B) 11.2 litres C) 44.8 litres 9. In 0.004g of Mg, the number of atoms is equal to? A) 24 B) 6.02 x 1023 C) 1 x 1023 10. In 18.016 g of H2O, how many molecules are present? A) 1 B) 18.016 C) 6.02 x 1023 11. How many molecules are present in one g of Hydrogen? A) 6.02 x 1022 B) 6.02 x 1023 C) 3.0115 x 1023 D) 84 litres D) 33.6 litres D) 96 D) None D) 3.0125x 1023</p> <p>12. Which of the following weights the least? A) 24 g of Mg B) 0.9 mole of nitric C) 22.4 l of N2 D) 6.023 x 1024 oxide molecules of O2 13. The number of molecules in 89.9 litres of a gas at OC and 1 atm pressure is? A) 6.023 x 1023 B) 12.04 x 1023 C) 18.06 x 1023 D) 24.08 x 1023 14. 4g of caustic soda contains? A) 6.023 x 1023 atoms B) 4g atoms of of hydrogen sodium C) 6.02 x 1023 atoms of sodium D) 4 moles of Neon1|Page out of |3[T e s t : 1 A ] [ T o p i c : C h e m i c a l L a n g u a g e ] [ P r e p a r e d b y : O s a m a H a s a n ]</p> <p>NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>CHEMICAL LANGUAGE 15. 12g of magnesium on reacting completely with acid gives hydrogen gas, the volumes of which of .T.P would be? A) 22.4 litres B) 11.2 litres C) 44.8 litres D) 6.1 litres 16. One litre of a gas at S.T.P weight 1.16g.It can be possible be? A) C2H2 B) CO C) O2 D) CH4</p> <p>NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>17. 0.5 mole of BaCl2 is mixed with 0.2 mole of a3PO4.The maximum number of mole of Ba3(PO)4 that can be formed is? A) 0.7 B) 0.5 C) 0.3 D) 0.1 18. 19.7kg of gold was recovered from a smuggler. How many atoms of gold were recovered? A) 100 B) 6.02 x 1023 C) 6.02 x 1024 D) 6.02 x 1025 19. How many formula units are there in a 42g sample of ( H4)2Cr2O7 (formula wt=252)? A) 7.0 x 1023 B) 1x 1023 C) 6 x 1023 D) 1.4 x 1023 20. The number of atoms present in 1 g of hydrogen gas is the same as present in? A) 0.4 g of He B) 22 g of CO2 C) 6 g of H2O D) 12 g of CO 21. The law of multiple proportions is illustrated by? A) KCl and KClO3 B) H2O2 and H2O C) NaBr and Nal 22. In a balanced chemical equation A) atoms are B) molecules are conserved conserved C) moles are conserved D) MnSO4 &amp; MgSO4 D) reactant and product are conserved D) HO2</p> <p>23. The empirical formula of hydrogen peroxide is? A) H2O2 B) HO C) H2O</p> <p>24. A hydrogen contains C=80%, H=20%. What is the empirical formula of compound (C=12, H=1) A) CH2 B) CH3 C) CH4 D) C2H6 25. C6H6 contains hydrogen by weight? A) 20% B) 6% C) 24% D) 80%</p> <p>26. Paracetamol C6H5(OH) HCOOH3 has molecular mass 156. It contains nitrogen by weight? A) 8.9 B) 11.1 C) 14 D) None of them 27. An anti-freeze has empirical formula CH3O. Its molecular mass is 62. What is its molecular formula A) CH3O B) C6H186O62 C) C2H6O D) C2H6O2 28. Which compound doesnt have molecular formula A) NaCl B) N2 C) Cl2 D) HNO3</p> <p>2|Page out of |3[T e s t : 1 A ] [ T o p i c : C h e m i c a l L a n g u a g e ] [ P r e p a r e d b y : O s a m a H a s a n ]</p> <p>NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>CHEMICAL LANGUAGE 29. Which one of the following compound, does not have the empirical formula CH2O A) HCHO B) C6H12O12 C) CH3COOH D) CH3CH2OH 30. A compound contains 87.5% Si and 12.5% H. what is the empirical formula of compound (relative atomic masses H = 1 and Si = 28) B) SiH3 C) SiH4 D) Si2H6 A) SiH2 31. 1 mole of C-12 has mass of? A) 18 B) .9.022 x 10-22 32. One mole of C-12 has mass of? A) 0.012 Kg B) 0.0012 Kg 33. I mole water is equals to? A) 22.4 dm3 B) 18 dm3 C) 6.022 x 1024 C) 1 Kg C) 1 dm3 D) 6.022 x 1023 D) 2 Kg D) none of them</p> <p>NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>3|Page out of |3[T e s t : 1 A ] [ T o p i c : C h e m i c a l L a n g u a g e ] [ P r e p a r e d b y : O s a m a H a s a n ]</p> <p>NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>CHEMICAL LANGUAGE</p> <p>CHEMISTRY TESTNSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>TEST O TOPIC</p> <p>STC PREPARATIO PROGRAMME : 1B DURATIO :CHEMICAL TECH IQUES PREPARED BY</p> <p>: 15 MI . : OSAMA HASAD) Calculation</p> <p>1. Which of the following is directly related to qualitative analysis? A) Identification B) Separation C) Measurement</p> <p>2. Which of the following process is used to separate insoluble particles from liquid? A) Separation B) Filtration C) Crystallization D) Condensation 3. The pore size of the filter paper depends upon? A) Nature of medium B) Temp. of medium C) Size of particles D) Mass of particles</p> <p>4. Which one is the property of an ideal solvent? A) Should be B) React chemically C) Impurities crystallize D) Should be safe to with solute expensive with solute use. 5. If the solvent is inflammable for heating purpose, we use? A) Ice bath B) Water bath C) Wire gauze 6. To prepare the medium sized crystal the hot filtrate is cooled? A) Slowly B) Fast C) Moderately D) Thermostat D) None</p> <p>7. When a solid which has high vapour pressure at a temperature below its boiling point, is heated, it starts A) Subliming B) Melting C) Decomposing D) Condensing 8. The process of filtration is used to separate A) Solute from B) Insoluble particles C) Two immiscible from liquid solution liquids D) Two miscible liquids</p> <p>9. In which process solid phase and vapour phase are directly involved? A) Sublimation B) Condensation C) Vaporization D) Filtration 10. In crystallization, the solvent is selected on the basis of? A) Hardness B) Porous nature C) Reactivity 11. After filtration slow cooling yields? A) Bigger &amp; pure B) Bigger &amp; impure crystals crystals C) Smaller &amp; pure D) Hit &amp; trial method D) Smaller &amp; impure D) Distribution D) All of above4|Page out of |3[T e s t : 1 A ] [ T o p i c : C h e m i c a l L a n g u a g e ] [ P r e p a r e d b y : O s a m a H a s a n ]</p> <p>12. Chromatography phenomenon is based on? A) Separation B) Precipitation C) Filtration 13. The technique of chromatography is used in? A) Separation B) Isolation C) Purification 14. Chromatography is important in?</p> <p>NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>CHEMICAL LANGUAGE A) Quality analysisNSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>B) Quantitative</p> <p>15. Without suction the filtration through filter paper is? A) Rapid B) Slow C) Time consuming 16. Solvent extraction is mostly applied to separate? A) Organic B) Inorganic C) Both A &amp; B compounds compounds 17. Solvent extraction method is used for compounds? A) Volatile B) Thermally C) Both A &amp; B unstable</p> <p>D) Effective D) None of them</p> <p>D) None</p> <p>18. Solvent extraction is an equilibrium process and it is controlled by? B) Law of mass C) Amount of solute D) Amount of A) Distribution law action used solvent</p> <p>5|Page out of |3[T e s t : 1 A ] [ T o p i c : C h e m i c a l L a n g u a g e ] [ P r e p a r e d b y : O s a m a H a s a n ]</p> <p>NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>C) Determination of D) All of above purity of substance</p> <p>CHEMICAL LANGUAGE</p> <p>CHEMISTRY TESTNSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>TEST O TOPIC</p> <p>STC PREPARATIO PROGRAMME : 1C DURATIO : PERIODIC TABLE PREPARED BY</p> <p>: 30 MI . : OSAMA HASA</p> <p>1. The valency, ionization energy, electron affinity and Electronegativity of elements are related to its A) Atomic Number B) Properties C) Atomic Weight D) Family Group 2. Which of the following is the most electronegative set of elements? A) N, O, F B) Ca, Sr, Ba C) Na, Mg, Al D) Fe, Co, Ni</p> <p>3. Which of the following elements has the maximum ionization potential? A) Mg B) Al C) Na D) K 4. Which of the following has lowest first ionization potential? A) B B) C C) N 5. Which has the minimum ionization potential? A) Mg B) AL C) Na D) O D) K D) I D) 6th</p> <p>6. Excluding H and He, the smallest element in the periodic table is? A) Li B) F C) Cs 7. Which transition series is incomplete? A) 3rd B) 4th C) 5th</p> <p>8. Which of the following element should be least metallic in character? A) Rb B) In C) Ti D) Po 9. Which of the following will have the largest atomic radius? A) F B) Cl C) Br D) I</p> <p>10. Which of the following will have the greatest value of Electronegativity when combined with hydrogen? A) Na B) Si C) S D) Cl 11. Which of the following has lowest first ionization potential? A) Na B) F C) I 12. Which of the following is most electronegative? B) Cl C) N A) O D) Cs D) F</p> <p>13. Which of the following metal require radiation of highest frequency to cause emission of electrons? A) Na B) Mg C) K D) Ca 14. Which of the following have lowest ionization energy? A) Pb B) Sn C) Si D) C6|Page out of |3[T e s t : 1 A ] [ T o p i c : C h e m i c a l L a n g u a g e ] [ P r e p a r e d b y : O s a m a H a s a n ]</p> <p>NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>CHEMICAL LANGUAGE 15. Among O, C, F, Cl and Br, the correct order of increasing radii is? A) F, O, C, Cl, Br B) F, C, O, Cl, Br C) F, Cl, Br, O, C D) C, O, F, Cl, Br 16. The correct arrangement of increasing order of atomic radius among a, K, Mg, Rb is? A) Mg&lt; K I- &gt; I+ B) I &gt; I+ &gt; IC) I+ &gt; I- &gt; I+ 28. Which of the following is the least inert? A) Xenon B) Neon C) Argon</p> <p>29. Which of the following alkali metals have highest density? A) Li B) Na C) Rb</p> <p>7|Page out of |3[T e s t : 1 A ] [ T o p i c : C h e m i c a l L a n g u a g e ] [ P r e p a r e d b y : O s a m a H a s a n ]</p> <p>NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>CHEMICAL LANGUAGE</p> <p>CHEMISTRY TESTNSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>TEST O TOPIC</p> <p>STC PREPARATIO PROGRAMME : 2 DURATIO : STATES OF MATTER PREPARED BY</p> <p>: 60 MI . : OSAMA HASA</p> <p>1. Equal weights of methane and hydrogen are mixed in an empty container at 25C.The fraction of the total pressure exerted by hydrogen is? A) th B) 8/9th C) 1/9 D) 16/17 2. The ratio of the rates of diffusion of SO2, O2 and CH4 is? A) 1:2:2 B) 1:2:4 C) 2:2:2 D) 1:2:2</p> <p>3. The rate of diffusion of methane at a given temperature is twice that of a gas X. The molecular weight of X is? A) 64 B) 32 C) 4 D) 8 4. Helium diffuses twice as fast as another gas B. If the vapour density of Helium is two, the molecular weight of B is? B) 8 C) 16 D) 24 A) 4 5. The vapour density of a gas is 11.2. The volume occupied by 11.2 g of the gas at .T.P is? A) 1 litre B) 11.2 litre C) 22.4 litre D) 44.8 litre 6. Two gases A and B, having moles ration 4:8 in a container; exert a pressure of 12 atm. If A is removed, what would be the pressure due to B only, temperature remaining constant? A) 4 atm B) 8 atm C) 12 atm D) None 7. A mixture in a gas cylinder at 1 atm pressure contains 65% volume. The partial pressure of nitrogen is? A) 0.65 atm B) 65 atm C) 130 atm2,</p> <p>15% O2, and 20% H2 by D) None</p> <p>8. A closed vessel contains equal number of oxygen and hydrogen molecules at a total pressure of 7400 mm. If oxygen is removed from the system, the pressure will? A) become 1/9th of B) become th of C) remain D) becomes double 740 mm 740 mm unchanged of 740 mm 9. At what temperature will be the volume of a gas at 0C double itself pressure remaining constant? A) 546 C B) 273 K C) 546 F D) 546 K 10. When the temperature of 23 ml of dry CO2 gas changed from 10C to 90C at constant pressure of 760 mm the volumes of the gas becomes closest to? B) 29.5 ml C) 24.6 ml D) 25 ml A) 21 ml 11. If 2 moles of an ideal gas at 546 K occupies a volume of 44.8 litres the pressure must be? A) 2 atm B) 4 atm C) 3 atm D) 1 atm</p> <p>8|Page out of |3[T e s t : 1 A ] [ T o p i c : C h e m i c a l L a n g u a g e ] [ P r e p a r e d b y : O s a m a H a s a n ]</p> <p>NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>CHEMICAL LANGUAGE 12. A bottle of cold drink contains 200 ml liquid in which CO2 is 0.1 molar. Suppose CO2 behaves like an ideals gas, the volume of the dissolved CO2, at STP is? A) 0.224 litre B) 0.448 litre C) 22.4 litres D) None 13. The temperature of a sample of SO2 gas is raised from 27C to 327C.The average kinetic energy of the gas molecule is? A) doubled B) halved C) multiplied by the D) raised to the factor of 327/27 power of two 14. The ratio of the rates of diffusion of CO2 and a gaseous oxide is 1.2:1 .The molecular weight of the gaseous oxide is? A) 63.36 B) 0.6336 C) 6.336 D) None 15. The volume of a given mass of gas is 117 ml at 39C .At what temperature will it be 213 ml? A) 273 K B) 39C C) 426 K D) 153 K 16. If 3 litres of oxygen are heated from 27C to 45C keeping pressure constant at 1 atm, the new volume will be? B) 4.67 litres C) 4.06 litres D) 3.18 litres A) 5 litres 17. The rate of diffusion of a gas A and B of mol. Wt. 100 and 81 respectively are in the ratio of? B) 10:09 C) 100:81 D) 81:100 A) 9:10 18. If 10 g of a gas at 1 atm pressure is cooled from 273C 10 0C keeping the volume constant, its pressure would become? A) 1/2 atm B) 1/273 atm C) 2 atm D) 273 atm 19. Pressure exerted by a perfect gas is equal to? A) mean kinetic B) half of mean C) two third of mean D) One third of mean energy per unit kinetic energy kinetic energy per kinetic energy per volume per unit volume unit volume unit volume 20. The internal energy of a gram-molecule of an ideal gas depends on? A) pressure alone B) volume alone C) temperature D) Both on pressure as alone well as temperature 21. The absolute temperature of a gas is determined by? B) the velocity of C) the no. of A) the average momentum of the sound in the gas molecules in the molecules gas 22. The motion of the molecules of a mono atomic gas is? A) Translatory B) Vibratory C) Rotatory D) The mean square velocity of the molecules D) All of the above</p> <p>NSTC-6 Preparation Programme| Aga Khan Higher Secondary School, Karachi.</p> <p>23. Gases exert pressure on the walls of the containing vessel because of the gas...</p>