1. A
   (i) $H_2O/H^+$ (ii) $CrO_3$
2. B
   (i) $BH_3$ (ii) $H_2O_2 / \overset{\ominus}{O}H$ (iii) PCC
3. C
   (i) $BH_3$ (ii) $H_2O_2 / \overset{\ominus}{O}H$ (iii) alk. $KMnO_4$ (iv) $H_3O^{\oplus}$
4. D
   (i) $H_2O/H^+$ (ii) PCC

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1. A
   (structure 1)
2. B
   (structure 2)
3. C
   (structure 3)
4. D
   (structure 4)

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1. A
   Reaction is at equilibrium.
2. B
   Reaction has a tendency to go in forward direction.
3. C
   Reaction has a tendency to go in backward direction.
4. D
   Reaction has gone to completion in forward direction.

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1. A
   4 mol of helium
2. B
   4 u of helium
3. C
   4 g of helium
4. D
   2.271098 L of helium at STP

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1. A
   A-IV, B-III, C-II, D-I
2. B
   A-IV, B-II, C-III, D-I
3. C
   A-I, B-II, C-III, D-IV
4. D
   A-II, B-III, C-IV, D-I

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1. A
   $-x$
2. B
   $-\dfrac{x}{9}$
3. C
   $-4x$
4. D
   $-\dfrac{4}{9}x$

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1. A
   A-I, B-IV, C-II, D-III
2. B
   A-IV, B-III, C-II, D-I
3. C
   A-III, B-IV, C-II, D-I
4. D
   A-III, B-IV, C-I, D-II

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1. A
   A-I, B-IV, C-II, D-III
2. B
   A-II, B-IV, C-III, D-I
3. C
   A-III, B-IV, C-I, D-II
4. D
   A-II, B-III, C-IV, D-I

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1. A
   $d^5$ to $d^4$ configuration
2. B
   $d^5$ to $d^2$ configuration
3. C
   $d^4$ to $d^5$ configuration
4. D
   $d^3$ to $d^5$ configuration

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1. A
   $PCl_{5(g)} \rightleftharpoons PCl_{3(g)} + Cl_{2(g)}$
2. B
   $H_{2(g)} + I_{2(g)} \rightleftharpoons 2HI_{(g)}$
3. C
   $CO_{(g)} + H_2O_{(g)} \rightleftharpoons CO_{2(g)} + H_{2(g)}$
4. D
   $2BrCl_{(g)} \rightleftharpoons Br_{2(g)} + Cl_{2(g)}$

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1. A
   O
2. B
   Se
3. C
   Te
4. D
   Po

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1. A
   B and D only
2. B
   A and E only
3. C
   B and C only
4. D
   A and D only

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1. A
   n-hexane
2. B
   2-methylpentane
3. C
   2,3-dimethylbutane
4. D
   2,2-dimethylbutane

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1. A
   Both Statement I and Statement II are correct
2. B
   Both Statement I and Statement II are incorrect
3. C
   Statement I is correct but Statement II is incorrect
4. D
   Statement I is incorrect but Statement II is correct

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1. A
   (plot 1)
2. B
   (plot 2)
3. C
   (plot 3)
4. D
   (plot 4)

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1. A
   B > A > C
2. B
   B > C > A
3. C
   A > C > B
4. D
   A > B > C

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1. A
   aqueous copper sulphate
2. B
   alkaline copper sulphate
3. C
   alkaline solution of sodium potassium tartrate (Rochelle's salt)
4. D
   aqueous sodium citrate

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1. A
   Both Statement I and Statement II are true
2. B
   Both Statement I and Statement II are false
3. C
   Statement I is true but Statement II is false
4. D
   Statement I is false but Statement II is true

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1. A
   Both Statement I and Statement II are true
2. B
   Both Statement I and Statement II are false
3. C
   Statement I is true but Statement II is false
4. D
   Statement I is false but Statement II is true

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1. A
   (structure 1)
2. B
   (structure 2)
3. C
   (structure 3)
4. D
   (structure 4)

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1. A
   Crystallization
2. B
   Sublimation
3. C
   Distillation
4. D
   Chromatography

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1. A
   A-II, B-III, C-IV, D-I
2. B
   A-I, B-III, C-IV, D-II
3. C
   A-I, B-IV, C-III, D-II
4. D
   A-II, B-IV, C-III, D-I

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1. A
   B and C
2. B
   A and D
3. C
   B and E
4. D
   E and D

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1. A
   A-IV, B-I, C-III, D-II
2. B
   A-III, B-I, C-II, D-IV
3. C
   A-IV, B-I, C-II, D-III
4. D
   A-I, B-IV, C-II, D-III

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1. A
   rate constant at standard temperature
2. B
   probability of collision
3. C
   orientation of reactant molecules during collision
4. D
   rate constant at two different temperatures

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