CBSE Class 12 Chemistry 2025 Sample Paper Solved Set 2

SECTION A

1 If molality of dilute solution is doubled, the value of molal depression constant (Kf ) will be
(a) halved
(b) tripled
(c) unchanged
(d) doubled

Answer : c

2 If M, N, O, P and Q are in the increasing order of their standard potentials in standard conditions of their standard half cells, then by combination of which two half cells maximum cell potential will be obtained?
(a) M and N
(b) M and O
(c) M and P
(d) M and Q

Answer : d

3 The rate of first order reaction is 0.04 mol L^–1 s^–1 at 10 sec. and 0.03 mol L^–1 s^–1 at 20 seconds after initiation of the reaction. t1/2 of reaction is _____.
(a) 44.1 s
(b) 54.1 s
(c) 24.1 s
(d) 34.1 s

Answer : c

4 Which of the following will show maximum paramagnetic nature?
(a) [Cr(H₂O)₆]³⁺
(b) [Fe(CN)₆]^4-
(c) [Fe(CN)₆]^3-
(d) [Cu(H₂O)₆]²⁺

Answer : c

5 Which of the following reaction confirms the presence of carbonyl group in glucose?
(a) Reaction with HI
(b) Reaction with NH₂OH
(c) Reaction with HCN
(d) both (b) and (c)

Answer : d

6 Which of the following pairs has the similar ionic size?
(a) Zr⁴⁺, Hf⁴⁺
(b) Zn²⁺, Hf⁴⁺
(c) Fe²⁺, Ni²⁺
(d) Zr⁴⁺, Ti⁴⁺

Answer : a

7 Which of the following is the correct order of decreasing SN₂ reactivity?
(a) RCH₂X>R₂CHX>R₃CX
(b) R₃CX>R₂CHX>RCH₂X
(c) R₂CHX>R₃CX>RCH₂X
(d) RCH₂X>R₃CX>R₂CHX

Answer : a

8 Which of the following haloalkane is optically active?
(a) 2-Chloropropane
(b) 2-Bromobutane
(c) 3-Iodopentane
(d) 1-Fluorobutane

Answer : b

9 Which one is an example of allylic alcohol?
(a) Prop-2-en-1-ol
(b) but-2-en-2-ol
(c) Prop-1-en-1-ol
(d) Prop-1-en-2-ol

Answer : a

10 Which of the following will not give iodoform test?
(a) Ethanol
(b) Ethanal
(c) Pentan-3-one
(d) Pentan-2-one

Answer : c

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