Phase Test (Screening)

PAGE AITS_CHEM(FT_01) - 8

NARAYANA IIT ACADEMY

(Andhra Pradesh, Kota and Delhi)

Max. Marks : 150 AITS (Full Test) CHEMISTRY Time: 2hrs.

Note : (1) Each question answered correctly is given +3 marks

(2) Each question answered incorrectly is given ( 1 mark

(3) 1 ( V questions are comprehensive containing 4 questions each1.A liquid which is immiscible in water was steam distilled at 95.20C at a total pressure of 0.983 atmosphere what is the mass of the liquid is present per gram of water in the distillate. Molar mass of the liquid is 134.3 gm/mol and vapour pressure of water is 0.84atm. (a) 1 gm (b) 1.27 gm

(c) 0.787 gm (d) 13.43 gm

Identify (C) in the given reaction above

3.Compound C2H2O3(A) on a reaction with 50% NaOH produces (B) and (C) .Compound (C) can be prepared by heating sodium formate at 3600C. What is the molecular formula of (B): (a)

(b)

(c)

(d)

4.What is the ratio of number of atoms per unit cell for molybdenum cubic crystal to the palladium cubic crystal? Use the data given below for Mo and Pd. MoPda/pm (edge length) 314 pm 388 pm (/g cm-3 10.312.16 Molar mass 95.9 g/mol 106.4 g/mol

(a) 1(b) 2(c) 1/2 (d) 3/2

5.What is the pH of a solution containing Na2CO3 and NaHCO3. If 50 mL of the solution requires 20 mL of 0.1N HCl solution in presence of phenolphthalein indicator for the first equivalence point. A further 25 mL of same HCl solution is required when methyl orange is added after the first equivalence point the pH of the log 2 = 0.3010. The pKa1 and pKa2 of H2CO3 is 6.38 and 10.28 respectively.

(a) 8.98 (b) 10.89 (c) 3.18 (d) 5.18

6.A solution was prepared by dissolving 0.1 gm CrCl3. 6H2O in sufficient water and volume made to 20mL. 2mL of this solution when treated with excess AgNO3 solution gave a precipitate. The precipitate is filtered, dried and weighed to be 0.01076 gm. What is the formula of the complex?(At. Masses of Cr = 52, Ag = 108)

(a) [Cr(H2O)6]Cl3 (b) [Cr(H2O)5Cl]Cl2 . H2O (c) [Cr(H2O)4Cl]Cl .2H2O(d) [Cr(H2O)3Cl3].3H2O

7.Identify the end product in the given reaction:

8.An orange solid (A) on heating produces a gas (B), which on reaction with Mg(s) followed by hydrolysis gives another gas (C). (C) form brown precipitate with K2HgI4 in presence of KOH. What could be (A), (a) NH4Cl (b) (NH4)2Cr2O7(c) (NH4)2CO3 (d) (NH4)2 C2O49.Which of the following does not exist as dimmer in benzene: (a) AlCl3 (b) HCOOH(c) BF3(d) All of them

10.In which compound all the sulphur atoms are the centre of tetrahedron:(a) H2S2O5(b) H2S2O7(c) H2S2O6 (d) Na2S4O6 11.How many number of moles can be oxidized of FeS2 by 1 mole of potassium permagnate in acidic medium so as to convert it into Fe3+ and SO2.(a) 1.2 (b) 5(c) 0.454 (d) 11

12.What is the end product of the following sequence of reaction:

13.Arrange the following in their increasing order of stability.

(a) II, I, III, IV(b) III, IV, I, II

(c) IV, III, I, II(d) IV, III, II, I

14.Which of the following is the correct order of the acidity:

(a) (III) > (I) > (II)(b) (I) > (II) > (III)(c) (II) > (I) > (III)(d) (III) > (II) > (I)

15. Which of the following statement is correct: (a) when a molecule can best be represented as a series of resonance forms each of these forms always contributes to the same degree in the hybrid.(b) A node is a region of high electron density between the two atoms in a covalent bond. (c) For a carbon atom, the 2s and 2p orbitals are equal in energy (d) When filling two or more orbitals of the same energy with electrons, the single electron is filled into different orbital rather than pair up in the same orbital

16.Identify the incorrect statement amongst the following(a) Liquid nitrogen does not sticks to the polls of magnate whereas liquid oxygen does.(b) NO2 is brown in colour at room temperature but colourless below 00C. (c) Bond order of and N2 are equal but is more reactive (d) NO+ is having lower bond strength then NO.

17.The heat of neutralization of HF, HNO2, HCN and HOCl are p, -q, -r, and s respectively. Where p > q > s > r. The correct order of pKa values of the given acids are (a) HF > HNO2 > HOCl > HCN(b) HCN > HNO2 > HOCl > HF(c) HCN > HOCl > HNO2 > HF(d) HOCl > HCN > HNO2 > HF

18.Match the following ions/molecules structure

Shape (a) (i) octahedral

(p) sea-saw(b) (ii) tetrahedral

(q) square pyramidal (c) (iii) triangle bipyramidal (r) bent shape(d) SO3 (iv) trigonal planer

(s) trigonal planer

(a) a (iii) p, b (iv) r, c (ii) s , d - (i)- q (b) a (iii) p, b (i) q, c (iv) r , d - (ii)- s (c) a (ii) q, b (iii) p, c (i) s , d - (iv)- r(d) a (i) q, b (iii) p, c (ii) r , d - (iv)- s

19.The plots of compressibility factor versus pressure is shown for the CH4, CO2 and NO2. Which of the gas will occupy least volume, the Vander Waal constant b is almost same for the given gases.

(a) CH4(b) CO2

(c) NO2(d) all occupy the same volume

20. Which of the following statements are true (i) Sucrose does not reduce fehling solution although both the constituent monosaccharides glucose and fructose reduces.(ii) Glucose and fructose are epimers (iii) Ketoses exists both in pyranose forms and as furanose derivative (iv) Monosaccharides are insoluble in water but soluble in ether. (a) (ii), (iii), (iv)(b) (i), (iii), (iv) (c) (i), (ii), (iii)(d) (i), (ii), (iv)

order of basic strength for the given compounds : (a) (I) > (IV) > (III) > (II) (b) (IV) > (I) > (III) > (II)(c) (II) > (III) > (I) > (IV)(d) (IV) > (II) > (III) > (I)

23.Electrode potential data given belowCl2 + 2H2O 2ClO( + 4H+ + 2e(; E0 = -1.61 voltClO( + 2H2O Cl + 4H+ + 4e(; E0 = -0.50 volt Based on these data which is the spontaneous reaction(a) Cl2 ClO( +

(b) ClO( Cl2 + Cl (c) Cl2 + ClO( (d) ClO( + Cl2

24.A dianion [x] decolourises the dichromate solution in acidified medium. Acidifying the sodium carbonate extract with acetic acid and adding calcium chloride, a white precipitate is obtained. The precipitate dissolves in dilute H2SO4 form [y] which on heating produce two gases. The [x] is (a)

(b)

(c)

(d)

25.Correct order of basicity is:

(a) IV > III > I > II

(b) I > II > IV > III(c) III > IV > I > II

(d) I > II > III > IV

26.What will be the surface area of catalyst which absorbs 224 cm3 of X2 (g) at S.T.P. per gram in order to form monomolecular layer of X2(g). The effective surface area occupied by a gas molecule on the surface of catalyst is 1.67 ( 10-16 cm2 (a) 2.24 ( 105 cm2(b) 106 cm2(c) 1.67 ( 105 cm2 (d) 6 ( 105 cm2

27.A reactant X(g) decomposes in the two way simultaneously

The decomposition follows first order kinetics and the rate constant K1 and K2 are 1.8 ( 10-4 and 3.0 ( 10-4 sec-1 respectively. What is the ratio of the concentration of Y and Z at 100 sec, when 1 M of X is initially taken (a) 3 : 5(b) 2 : 5(c) 5 : 3 (d) 5 : 2

28.The following questions consist of two statement, one labelled ASSERTION (A) and the another labelled REASON (R) select the correct answers to these questions Assertion(A) : Thiosulphuric acid, H2S2O3 cannot be prepared by adding acid to a thiosulphate.Reason(R) : The free acid decomposes in water into a mixture of S, H2S, H2Sn, SO2 and H2SO4 (a) both A and R are true and R is the correct explaination of A. (b) both A and R are true but R is not the correct explaination of A(c) A is true but R is false (d) both A and R are false

Compound (X) and (Z) are respectively

30.The relative rate of extraction of H and D is 2.6 : 1. The percentage yield of the product A and B in the following reaction is:

(a) 27.8%, 72.2%(b) 72.2%, 27.8%(c) 56.52%, 43.48%(d) 43.48%, 56.52%

P-1.Glycerol is a trihydric alcohol when it is treated with potassium hydrogen sulphate it form a compound (A). Compound (A) gives the following reaction:

Substance (E) can be used in medicinal purpose.

31.Compound (D) in the given sequence of reaction is

32.When compound (B) is treated with 50% NaOH, then it gives two compound which on reaction on reaction in an acidified medium terms (a) CH3COOH (b) HCOOCH3(c) CH3COOCH3 (d) CH3COOC2H5

33.Compound (C) is (a) Glycolic acid (b) Glycerol (c) Oxalic acid (d) Glyoxal

34.Which of the following statements is true for (C): (I) It reduces Tollens reagent

(II) It reduces Fehling solution (III) It gives Canizzarro reaction with conc. Base. (a) I only (b) I, II(c) I, III(d) III only

The product of the reaction is :

P-2.Colloid is heterogeneous system is which are substance is dispersed as very fine particles in another substance called dispersion medium

A solution is a homogeneous system. The essential difference between a solution and a colloid is one of particle size. In a solution, the particles are ions or small molecules in a colloid, the dispersed phase may consist of particles of a single macromolecule (such as protein or synthetic polymer) or an aggregate of many atoms, ions or molecules.

Colloidal particles are larger than simple molecules but small enough to remain suspended.

Depending upon mlether the dispersed phase and dispersion medium are solids, liquids and gases, eight types of colloidal systems are possible.

Dispersed phase Dispersion medium Types of colloid.

Solid Solid

Solid solution

Solid Liquid

Solution

Solid Gas

Aerosol

Liquid Solid

Gel Liquid Liquid

Emulsion

Liquid Gas

Aerosol

Gas Solid

Solid solution

Gas

Liquid

Foam

Depending upon the type of the particles of the dispersed phase, colloids are classified as multimolecular and associated colloids:

36.Which of the following does not result formation of solution.

(A)

(B)

(C)

(D) None of these

37.Hair cream is an example of:(a) Gel (b) Emulsion(c) Solution (d) Aerosol

38.Which of the following is not an example of aerosol: (a) Fog(b) Smoke (c) Froth (d) cloud

39.Depending upon the nature of interaction between the dispersed phase and the dispersion medium colloidal sols are lyophillic and lyophobic. Which of the following is not result lyophobic colloidal solution on mixing with suitable liquid (a) Gelatin (b) Starch (c) Rubber(d) all of them

40.Match the followings:(A) Sol (I) Milk (B) Gel (II) Whipped cream (C) Foam (III) Cheese (D) Emulsion (IV) Paints (a) (A)(I) , (B) (II), (C)-(II), (D)(IV)(b) (A)(III) , (B) (II), (C)-(I), (D)(IV)(c) (A)(II) , (B) (IV), (C)-(III), (D)(I) (d) (A)(IV) , (B) (III), (C)-(II), (D)(I)

P-3.The rate constant for most of the reactions increases with the increase of temperature. It has been found that a plot of log10K against 1/T gives a straight line (as shown in fig) represented by the equation log10K =

The equation is known as Arrhenius equation and also be written as For an equilibrium reaction A(g) B(g)

The rate constant of forward reaction increases by 130% when its temperature is raised from 300 K to 310 K. The ratio of activation energy of forward reaction to backward reaction is 1 : 3. [Log2.3 = 0.361, antilog (-0.723) = 0.189]

41.By increasing the temperature, the effect on equilibrium constant :(a) It decreased by 130%(b) It decreases by 19%(c) It decreases by 81%(d) It does not change

42.The activation energy of the forward reaction is (a) 7.92KJ(b) 64.41 KJ(c) 16.2 KJ(d) 6.44 KJ

43.For the given reaction, the temperature coefficient of the forward reaction is (a) 1. 3(b) 0.77

(c) 0.43(d) 2.3

44.What fraction of molecules are in the activated state in forward reaction

[antilog (0.79) = 6.61](a) 6.16 ( 10-12 %(b) 6.16 ( 10-10 %

(c) 6.16 ( 10-8 %

(d) 6.16 ( 10-6 %

45.For the reactions (i) X Y ; Ea = 40 KJ mol-1 and (ii) X Y ; Ea( = 80 KJ mol-1for the same 100C rise in temperature which of the following statement is correct (a) Both the reactions rate increases to an equal extent.(b) Increase in rate of reaction (i) is more than that of (ii) (c) Increase in rate of reaction (ii) is more than that of (i) (d) The rate will not be affected P-4.An alkene can be converted to alcohol by the following three methods:(a) acid catalysed hydration (b) oxymercuration demercuration reaction (c) Hydroboration oxidation the reactions are as shown below:

EMBED ACD.ChemSketch.20

In first method formation of alcohol takes place via formation of carbocation so there is a possibility of rearrangement where as in oxymeration demercuration and hydroboration-oxidation formation of alcohol takes place without any rearrangement of structure because the formation of carbocation does not takes place. An alkene (X) C10H12 from three isomeric alcohols by the above three methods as

Alkene (X) with hot KMnO4 gives C7H6O2 which gives effervcence with NaHCO3

46.What is the structure of (X) :

47.The end product for the given sequence of reactions:

48.When 1-ethyl-6-methyl cyclohexene is treated with mercuric acetate in presence of methyl alcohol followed sodium borohydride gives-

Identify the product in the given reaction:

50.Identify the final product of the given reaction:

* * *

NARAYANA IIT ACADEMY

(Andhra Pradesh, Kota and Delhi)

AITS CHEMISTRYANSWERS

12345678910

BDCCBBABCB

11121314151617181920

CBCADDCDCC

21222324252627282930

CBBCBBBABC

31323334353637383940

BBDCBDBCDD

41424344454647484950

CBDBCDACCD

Hints and Solution

1.PT = 0.983 atm

;

(

4.For M0

=

For Mo N = 2 BCC lattice

Pd N = 4 FCC lattice

5.

Na2CO3 = 20 ( 0.1 = 2Meq Na2CO3 = 4

Na2CO3 + Meq NaHCO3 = 25 ( 0.1 = 2.5 Meq NaHCO3 = 0.5

= 10.28 + log = 10.28 + 0.6020 = 10.88

6.Let formula of CrCl3.6H2O ( [Cr(H2O)nClx] Cl3-x .(6 n)H2O

[Cr(H2O)nClx]Cl3-x (6 n)H2O + (3-x)AgNO3 ( (3 x) AgCl((ppt.)wt. of complex compound for 2 mL is 0.01 gm

solving x = 1 ( Formula is [Cr(H2O)5Cl]Cl2. H2O

9.AlCl3 and HCOOH exist as dimmer in benzene.

11.FeS2 + KMnO4 Fe3+ + SO2 + Mn2+ (n = 11) (n = 5) (

( = 0.454 mole

19.The order of a value NO2 > CO2 > CH4 (as per graph). If the gases are having same value of b but different values of a, then the gas having larger value of a will occupy lesser volume. This is due to larger force of attraction hence the lesser distance between its molecules.

24.

+ + CO2 H2C2O4 H2O + CO + CO2

26.No. of molecules ( N = = 6.023 ( 1021 Area/molecule = 1.67 ( 10-16 cm2 total surface area covered by X2 (g) / gram of the catalyst = 1.67 ( 10-16 ( 6.023 ( 1021 = 10.06 ( 105 cm2

27.

30.

( % A =

P-3.

( Eaf = = 64.41 kJ As (

The reaction is exothermic so by increasing the temperature the equilibrium constant decreases

= -2 ( log2.3 (

K2 ( 0.19 K1( equilibrium constant decreases. And it decreases by 81%.

* * *

(1/T)

lg10 K

Color : GREEN

Color : GREEN

NARAYANA IIT ACADEMYSouth Centre: 47 B, Kalu Sarai, N. Delhi-16. North West Centre: 2/40, Adj. Central Mkt., W. Punjabi Bagh, N. Delhi-26.NARAYANA IIT ACADEMYSouth Centre: 47 B, Kalu Sarai, N. Delhi-16. North West Centre: 2/40, Adj. Central Mkt., W. Punjabi Bagh, N. Delhi-26.

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