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sample paper for chemistry
sample paper-i
1. Among the following, the most acidic is
(A) p-nitrophenol (B) p-hydroxybenzoic acid
(C) o-hydroxybenzoic acid (D) p-toluic acid
Sol. (C)
2. Extra pure N2 can be obtained by heating
(A) NH3 with CuO (B) NH4NO3
(C) (NH4)2Cr2O7 (D) Ba(N3)2
ans. (D)
3. Geometrical shapes of the complexes formed by the reaction of Ni2+ with Cl-, CN- and H2O, respectively, are
(A) octahedral, tetrahedral and square planar (B) tetrahedral, square planar and octahedral
(C) square planar, tetrahedral and octahedral (D) octahedral, square planar and octahedral
ans. (B)
4. Bombardment of aluminium by a-particle leads to its artificial disintegration in two ways, (i) and (ii) as shown. Products X, Y and Z respectively are
(A) proton, neutron, positron (B) neutron, positron, proton
(C) proton, positron, neutron (D) positron, proton, neutron
ans. (A)
5. Dissolving 120 g of urea (mol. wt. 60) in 1000 g of water gave a solution of density 1.15 g/mL. The molarity of the solution is
(A) 1.78 M (B) 2.00 M
(C) 2.05 M (D) 2.22 M
ans. (C)
Multiple Correct Answer Type
6. The correct statement(s) pertaining to the adsorption of a gas on a solid surface is (are)
(A) Adsorption is always exothermic
(B) Physisorption may transform into chemisorption at high temperature
(C) Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature
(D) Chemisorption is more exothermic than physisorption, however it is very slow due to higher energy of activation.
ans. (A, D)
7. Extraction of metal form the ore cassiterite involves
(A) carbon reduction of an oxide ore (B) self-reduction of a sulphide ore
(C) removal of copper impurity (D) removal of iron impurity
ans. (A, C, D)
8. According to kinetic theory of gases
(A) collisions are always elastic
(B) heavier molecules transfer more momentum to the wall of the container.
(C) only a small number of molecules have very high velocity
(D) between collisions, the molecules move in straight lines with constant velocities.
ans. (A, B, C, D)
9. Amongst the given options, the compound(s) in which all the atoms are in one plane in all the possible conformations (if any), is (are)
(A)
(C)
ans. (B, C)
(Paragraph Type)
This section contains 2 paragraphs. Based upon one of the paragraphs 2 multiple choice questions and based upon the other paragraph 3 multiple choice questionshave to be answered. Each of these questions has four choices A), B), C), D) out of whichONLY ONE is correct.
When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH3 dissolves O and gives an intense blue solution.
10. The metal rod M is
(A) Fe (B) Cu
(C) Ni (D) Co
ans. (B)
11. The compound N is
(A) AgNO3 (B) Zn(NO3)2
(C) Al(NO3)3 (D) Pb(NO3)2
ans. (A)
12. The final solution contains
(A) [Pb(NH3)4]2+ and [CoCl4]2- (B) [Al(NH3)4]3+ and [Cu(NH3)4]2+
(C) [Ag(NH3)2]+ and [Cu(NH3)4]2+ (D) [Ag(NH3)2+ and [Ni(NH3)6]2+
ans. (C)
(Integer Answer Type)
*13. The total number of alkenes possible by dehydrobromination of 3-bromo-3-cyclopentylhexane using alcoholic KOH is
Sol. 5
14. A decapetide (Mol. Wt. 796) on complete hydrolysis gives glycine (Mol. Wt. 75), alanine and phenylalanine. Glycine contributes 47.0 % to the total weight of the hydrolysed products. The number of glycine units present in the decapeptide is
Ans.. 6
15. To an evacuated vessel with movable piston under external pressure of 1 atm, 0.1 mol of He and 1.0 mol an unknown compound (vapour pressure 0.68 atm. at 0oC) are introduced. Considering the ideal gas behaviour, the volume (in litre) of the gasses at 0oC is close to
ans. 7
16. The work function (f) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is
Metal
|
Li
|
Na
|
K
|
Mg
|
Cu
|
Ag
|
Fe
|
Pt
|
W
|
f (eV)
|
2.4
|
2.3
|
2.2
|
3.7
|
4.8
|
4.3
|
4.7
|
6.3
|
4.75
|
ans. 4
17. The maximum number of electrons that can have principal quantum number, n = 3, and spin quantum number, ms =
ans. 9
18. Reaction of Br2 with Na2CO3 in aqueous solution gives sodium bromide and sodium bromate with evolution of CO2 gas. The number of sodium bromide molecules involved in the balanced chemical equation is
ans. 5
19. The difference in the oxidation numbers of the two types of sulphur atoms in Na2S4O6 is
Ans…. 5
sample paper for chemistry
sample paper-ii
(Single correct Answer Type)
1. Oxidation states of the metal in the minerals haematite and magnetite, respectively are
(A) II, III in haematite and III in magnetite
(B) II, III in haematite and II in magnetite
(C) II in haematite and II, III in magnetite
(D) III in haematite and II, III in magnetite
Sol. (D)
2. Among the following complexes (K-P)
K3[Fe(CN)6] (K), [Co(NH3)6]Cl3 (L), Na3[Co(oxalate)3] (M), [Ni(H2O)6]Cl2 (N),
K2[Pt(CN)4] (O) and [Zn(H2O)6] (NO3)2 (P)
the diamagnetic complexes are
(A) K L, M, N (B) K, M, O, P
(C) L, M, O, P (D) L, M, N, O
Sol. (C)
3. Passing H2S gas into a mixture of Mn2+, Ni2+, Cu2+ and Hg2+ ions in an acidified aqueous solution precipitates
(A) CuS and HgS (B) MnS and CuS
(C) MnS and NiS (D) NiS and HgS
Sol. (A)
4. The freezing point (in oC) of a solution containing 0.1 g of K3[Fe(CN)6] (Mol. Wt. 329) in 100 g of water (Kf = 1.86 K Kg mol-1) is
(A) -2.3 ´ 10-2 (B) -5.7 ´ 10-2
(C) -5.7 ´ 10-3 (D) -1.2 ´ 10-2
Sol. (A)
5. The following carbohydrate is
(A) a ketohexose (B) an aldohexose
(C) an a-furanose (D) an a-pyranose
Sol. (B)
(Multiple Correct Answer(s) Type)
6. Reduction of the metal centre in aqueous permanganate ion involves
(A) 3 electrons in neutral medium (B) 5 electrons in neutral medium
(C) 3 electrons in alkaline medium (D) 5 electrons in acidic medium
Sol. (A, D)
7. For the first order reaction
(A) the concentration of the reactant decreases exponentially with time.
(B) the half-life of the reaction decreases with increasing temperature.
(C) the half-life of the reaction depends on the initial concentration of the reactant.
(D) the reaction proceeds to 99.6 % completion in eight half-life duration.
Sol. (A, B, D)
(Integer Answer Type)
8. Among the following, the number of compounds that can react with PCl5 to give POCl3 is O2, CO2, SO2, H2O, H2SO4, P4O10
Sol. (4)
9. The volume (in mL) of 0.1 M AgNO3 required for complete precipitation of chloride ions present in 30 mL of 0.01 M solution of [Cr(H2O)5Cl]Cl2, as silver chloride is close to
Sol. (6)
10. In 1 L saturated solution of AgCl [Ksp(AgCl) = 1.6 ´ 10-10], 0.1 mol of CuCl [Ksp(CuCl) = 1.0 ´ 10-6] is added. The resultant concentration of Ag+ in the solution is 1.6 ´ 10-x. The value of “x” is
Sol. (7)
11. The number of hexagonal faces that are present in a truncated octahedron is
Sol. (8)
12. The maximum number of isomers (including stereoisomers) that are possible on monochlorination of the following compound, is
Sol. (8)
13. The total number of contribution structures showing hyperconjugation (involving C-H bonds) for the following carbocation is
Sol. (6)
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