CBSE Class 12 Chemistry 2025 Sample Paper Solved Set 1

SECTION A

1 Which of the following ions show highest spin only magnetic moment value?
a) Ti³⁺
b) Mn²⁺
c) Fe²⁺
d) Co³⁺

Answer : b

2 The compound [Co(NH₃)₅(SO₄)]Br and [Co(NH₃)₅(Br)]SO₄ represent:
a) Linkage isomerism
b) Ionization isomerism
c) Coordination isomerism
d) Geometrical isomerism

Answer : b

3 Toluene reacts with a halogen in the presence of iron (III) chloride giving ortho and para halo compounds. The reaction is
a) Electrophilic substitution reaction
b) Nucleophilic substitution reaction
c) Electrophilic elimination reaction
d) Free radical addition reaction

Answer : a

4 Acidified potassium dichromate solution turns green when Na₂SO₃ is added to it. This is due to the formation of
a) CrSO ₄
b) Cr₂(SO4) ₃
c) CrO₄^2-
d) CrO₂^-

Answer : b

5 Best method for preparing primary amine from alkyl halide without changing the number of carbon atoms in the chain is
a) Hofmann bromamide reaction
b) Gabriel pthalimide reaction
c) Sandmayer’s reaction
d) Reaction with ammonia

Answer : b

6 The product obtained when (CH₃)₃ C-Br react with CH₃ ONa
a) t-butylmethyl ether
b) 2-methylpropene
c) Sec-butylmethyl ether
d) Sodium butoxide

Answer : b

7 The correct IUPAC name for CH₂=CHCH₂ NHCH₃ is
a) Allylmethylamine
b) 2-amino-4-pentene
c) 4-aminopent-1-ene
d) N-methyl prop-2-en-1-amine

Answer : d

8 In a chemical reaction X → Y. it is found that the rate of reaction doubles when the
concentration of X is increased four times. The order of the reaction with respect to X is
a) 1
b) 0
c) 2
d) ½

Answer : d

9 The unit of rate constant for the reaction
2H₂ + 2NO → 2H₂O + N₂
which has rate = K|H₂||NO|², is
a) mol L^-1 s^-1
b) s-1
c) mol^-2 L² s^-1
d) mol L^-1

Answer : c

10 Nucleotides are joined together by
a) Glycosidic bond
b) Peptide linkage
c) Hydrogen bond
d) Phosphodiester linkage

Answer : d

11 Which of the following compounds is most reactive towards nucleophilic addition reaction?
a) CH₃ CHO
b) CH₃ CO CH₃
c) C₆ H₅ CHO
d) C₆ H₅ COCH₃

Answer : a

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