Chemistry
SECTION – I
Straight Objective Type
This section contains 6 multiple choice questions. Each question has 4 choices (A), (B), (C) and (D), out of which ONLY ONE is correct.
1. Hyperconjugation involves overlap of the following orbitals
(A) σ – σ
(B) σ – p
(C) p – p
(D) π – π
2. The major product of the following reaction is
(A) 
(B) 
(C) 
(D) 
3. Aqueous solutions of Na2S2O3 on reaction with Cl2 gives
(A) Na2S4O6
(B) NaHSO4
(C) NaCl
(D) NaOH
4. Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of
(A) nitrogen
(B) oxygen
(C) carbon dioxide
(D) argon
5. Under the same reaction conditions, initial concentration of 1.386 mol dm−3 of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics, respectively. Ratio 
of the rate constants for first order (k1) and zero order (k0) of the reactions is
(A) 0.5 mol−1 dm3
(B) 1.0 mol dm−3
(C) 1.5 mol dm−3
(D) 2.0 mol−1 dm3
6. 2.5 mL of 
weak monoacidic base (Kb = 1 × 10−12 at 25℃) is titrated with 
HCl in water at 25℃. The concentration of H+ at equivalence point is (Kw = 1 × 10−14 at 25℃)
(A) 3.7 × 10−13 M
(B) 3.2 × 10−7 M
(C) 3.2×10−2M
(D) 2.7×10−2M
SECTION – II
Multiple Correct Answers Type
This section contains 4 multiple correct answer(s) type questions. Each question has 4 choices (A), (B), (C) and (D), out of which ONLY OR MORE is/are correct.
7. The correct statement (s) about the compound given below is (are)
(A) The compound is optically active
(B) The compound possesses centre of symmetry
(C) The compound possesses plane of symmetry
(D) The compound possesses axis of symmetry
8. The correct statement (s) concerning the structures E, F and G is (are)
(A) E, F and G are resonance structures
(B) E, F and E, G are tautomers
(C) F and G are geometrical isomers
(D) F and G are diasteromers
9. A solution of colourless salt H on boiling with excess NaOH produces a non-flammable gas. The gas evolution ceases after sometime. Upon addition of Zn dust to the same solution, the gas evolution restarts. The colourless salt (s) H is (are)
(A) NH4NO3
(B) NH4NO2
(C) NH4Cl
(D) (NH4)2SO4
10. A gas described by van der Waal’s equation
(A) behaves similar to an ideal gas in the limit of large molar volumes
(B) behaves similar to an ideal gas in the limit of large pressures
(C) is characterized by van der Waal’s coefficients that are dependent on the identify of the gas but are independent of the temperature
(D) has the pressure that is lower than the pressure exerted by the same gas behaving ideally
SECTION – III
Reasoning Type
This section contains 4 reasoning type questions. Each question has 4 choices (A), (B), (C) and (D), out of which ONLY ONE is correct.
11. STATEMENT-1: Bromobenzene upon reaction with Br2/Fe gives 1, 4 – dibromobenzene as the major product.
and
STATEMENT-2: In bromobenzene, the inductive effect of the bromo group is more dominant than the mesomeric effect in directing the incoming electrophile.
(A) STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is correct explanation for STATEMENT-1
(B) STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
(C) STATEMENT-1 is True, STATEMENT-2 is False
(D) STATEMENT-1 is False, STATEMENT-2 is True
12. STATEMENT-1: Pb4+ compounds are stronger oxidizing agents than Sn4+
and
STATEMENT-2: The higher oxidation states for the group 14 elements are more stable for the heavier members of the group due to ‘inert pair effect’.
(A) STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is correct explanation for STATEMENT-1
(B) STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
(C) STATEMENT-1 is True, STATEMENT-2 is False
(D) STATEMENT-1 is False, STATEMENT-2 is True
13. STATEMENT-1: The plot of atomic number (y-axis) versus number of neutrons (x-axis) for stable nuclei shows a curvature towards x-axis from the line of 45° slope as the atomic number is increased.
and
STATEMENT-2: Proton-proton electrostatic repulsions begin to overcome attractive forces involving protons and neutrons and neutrons in heavier nuclides.
(A) STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is correct explanation for STATEMENT-1
(B) STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
(C) STATEMENT-1 is True, STATEMENT-2 is False
(D) STATEMENT-1 is False, STATEMENT-2 is True
14. STATEMENT-1: For every chemical reaction at equilibrium, standard Gibbs energy of reaction is zero.
and
STATEMENT-2: At constant temperature and pressure, chemical reactions are spontaneous in the direction of decreasing Gibbs energy.
(A) STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is correct explanation for STATEMENT-1
(B) STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
(C) STATEMENT-1 is True, STATEMENT-2 is False
(D) STATEMENT-1 is False, STATEMENT-2 is True
SECTION – IV
Linked Comprehension Type
This section contains 3 paragraphs. Based upon each paragraph, 3 multiple choice questions have to be answered. Each question has 4 choices (A), (B), (C) and (D), out of which ONLY ONE is correct.
Paragraph for Question Nos. 15 to 17
In the following sequence, products I, J and L are formed. K represents a reagent.
15. The structure of the product I is
(A) 
(B) 
(C) 
(D) 
16. The structures of compounds J and K respectively are
(A) 
`
(B) 
(C) 
(D) 
17. The structure of product L is
(A) 
(B) 
(C) 
(D) 
Paragraph for Question Nos. 18 to 20
There are some deposits of nitrates and phosphates in earth’s crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under the laboratory conditions but microbes do it easily. Ammonia forms large number of complexes with transition metal ions. Hybridization easily explains the ease of sigma donation capability of NH3 and PH3. Phosphine is a flammable gas
and is prepared from white phosphorus.
18. Among the following, the correct statement is
(A) Phosphates have no biological significance in humans
(B) Between nitrates and phosphates, phosphates are less abundant in earth’s crust
(C) Between nitrates and phosphates, nitrates are less abundant in earth’s crust
(D) Oxidation of nitrates is possible in soil
19. Among the following, the correct statement is
(A) Between NH3 and PH3, NH3 is better electron donor because the lone pair of electrons occupies spherical ‘s’ orbital and is less directional
(B) Between NH3 and PH3, PH3 is better electron donor because the lone pair of electrons occupies sp3 orbital and is more directional
(C) Between NH3 and PH3, NH3 is a better electron donor because the lone pair of electrons occupies sp3 orbital and is more directional
(D) Between NH3 and PH3, PH3 is better electron donor because the lone pair of electrons occupies spherical ‘s’ orbital and is less directional
20. White phosphorus on reaction with NaOH gives PH3 as one of the products. This is a
(A) dimerization reaction
(B) disproportionation reaction
(C) condensation reaction
(D) precipitation reaction
Paragraph for Question Nos. 21 to 23
Properties such as boiling point, freezing point and vapour pressure of a pure solvent change when solute molecules are added to get homogeneous solution. These are called colligative properties. Applications of colligative properties are very useful in day-today life. One of its examples is the use of ethylene glycol and water mixture as anti-freezing liquid in the radiator of automobiles.
A solution M is prepared by mixing ethanol and water. The mole fraction of ethanol in the mixture is 0.9.
Given: Freezing point depression constant of water
Freezing point depression constant of ethanol 
Boiling point elevation constant of water 
Boiling point elevation constant of ethanol 
Standard freezing point of water = 273 K
Standard freezing point of ethanol = 155.7 K
Standard boiling point of water = 373 K
Standard boiling point of ethanol = 351.5 K
Vapour pressure of pure water = 32.8 mm Hg
Vapour pressure of pure ethanol = 40 mm Hg
Molecular weight of water = 18 g mol−1
Molecular weight of ethanol = 46 g mol−1
In answering the following questions, consider the solutions to be ideal dilute solutions and solutes to be non-volatile and nondissociative.
21. The freezing point of the solution M is
(A) 268.7 K
(B) 268.5 K
(C) 234.2 K
(D) 150.9 K
22. The vapour pressure of the solution M is
(A) 39.3 mm Hg
(B) 36.0 mm Hg
(C) 29.5 mm Hg
(D) 28.8 mm Hg
23. Water is added to the solution M such that the fraction of water in the solution becomes 0.9. The boiling point of this solution is
(A) 380.4 K
(B) 376.2 K
(C) 375.5 K
(D) 354.7 K
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