CBSE 12 Chemistry Question Paper-2025 Set-5 by Pavan | Practice Test to Test Your Knowledge
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  3. CBSE 12 Chemistry Question Paper-2025 Set-5
CBSE 12 Chemistry Question Paper-2025 Set-5

CBSE 12 Chemistry Question Paper-2025 Set-5

This mock test includes actual CBSE Class 12 Chemistry board exam questions from the year 2025 set-5, helping students understand exam trends and practice real paper format

2025-08-19
Pavan Pavan
CBSE Class 12 Chemistry 2025 Grade 12

Duration

25 min

Questions

24

Marking

Negative

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Questions Preview

The Williamson synthesis method for the formation of unsymmetrical ethers is:

A
Sₙ1 reaction
B
Sₙ2 reaction
C
Electrophilic addition reaction
D
Elimination reaction

Which of the following compounds will be most easily hydrolyzed by aqueous KOH?

A
CH₂=CH-Br
B
CH₃-CH₂-Br
C
CH₃-CH(Br)-CH₃
D
CH₂=CH-CH₂-Br

Which of the following does not form a stable hydrate on treatment with water?

A
Hexafluoroacetone
B
Acetaldehyde
C
Acetone
D
Chloral

CH₃CH₂OH can be converted to CH₃CHO by:

A
treatment with KMnO₄
B
treatment with PCC
C
treatment with LiAlH₄
D
catalytic hydrogenation

Which of the following is an example of a biodegradable polymer?

A
PVC
B
Terylene
C
PHBV
D
Nylon-6,6

Which of the following is a condensation polymer?

A
Polythene
B
Nylon-6,6
C
PVC
D
Teflon

Assertion (A): On moving down the group 16, the stability of hexahalides decreases while that of tetrahalides increases. Reason (R): On moving down the group, the tendency to show +6 oxidation state decreases, while the stability of +4 oxidation state increases due to inert pair effect.

A
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
B
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
C
Assertion (A) is true, but Reason (R) is false.
D
Assertion (A) is false, but Reason (R) is true.

The complex $[Co(NH_{3}){5}Cl]Cl{2}$ and $[Co(NH_{3}){5}Cl]SO{4}$ are examples of:

A
Ionization isomers
B
Linkage isomers
C
Coordination isomers
D
Geometrical isomers

A compound formed by the interaction of an aryl diazonium salt and phenol is an example of:

A
Diazotisation reaction
B
Coupling reaction
C
Sandmeyer reaction
D
Gatterman reaction

Which of the following complexes is homoleptic?

A
$[Cr(NH_{3})_{4}Cl_{2}]^{+}$
B
$[Co(NH_{3})_{5}Cl]Cl_{2}$
C
$[Co(en)_{2}Cl_{2}]^{2+}$
D
$[Fe(CN)_{6}]^{3-}$

Which of the following will not undergo Friedel-Crafts reaction?

A
Toluene
B
Benzene
C
Aniline
D
Chlorobenzene

The IUPAC name of the compound $(CH_{3}){3}C-CH{2}CH_{3}$ is:

A
2,2-dimethylbutane
B
2-ethyl-2-methylpropane
C
2,3-dimethylbutane
D
2,2-dimethylpentane

Assertion (A): On adding a non-volatile solute to a solvent, the freezing point of the solvent decreases. Reason (R): The boiling point of a solution is always lower than that of the pure solvent.

A
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
B
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
C
Assertion (A) is true, but Reason (R) is false.
D
Assertion (A) is false, but Reason (R) is true.

Assertion (A): For a first order reaction, if the concentration of the reactant is doubled, its half-life also gets doubled. Reason (R): The half-life of a first order reaction does not depend on the initial concentration of the reactant.

A
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
B
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
C
Assertion (A) is false, but Reason (R) is true.
D
Assertion (A) is true, but Reason (R) is false.

Assertion (A): Copper metal cannot liberate hydrogen from dilute acids. Reason (R): Copper has positive electrode potential.

A
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
B
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
C
Assertion (A) is true, but Reason (R) is false.
D
Assertion (A) is false, but Reason (R) is true.

The molar conductivity of an electrolyte increases on dilution because:

A
ionic mobility increases.
B
number of ions increases.
C
degree of dissociation increases.
D
interionic forces of attraction increases.

The IUPAC name of the compound CH₃CH₂CH(CH₃)CH₂CH₃ is:

A
2-ethylbutane
B
3-methylpentane
C
2,2-dimethylbutane
D
2,3-dimethylbutane

The IUPAC name of the compound CH₃-O-CH₂CH₃ is:

A
Ethoxyethane
B
Methoxyethane
C
Methoxypropane
D
Ethoxypropane

The charge required for the reduction of 1 mol of MnO₄⁻ to MnO₂ is:

A
1 F
B
3 F
C
5 F
D
6 F

Which of the following complexes is an inner orbital complex and is paramagnetic in nature?

A
[CoF₆]³⁻
B
[Fe(CN)₆]⁴⁻
C
[Co(NH₃)₆]³⁺
D
[Ni(CO)₄]

A compound with molecular formula C₄H₁₁N which gives a foul-smelling product on reaction with chloroform and ethanolic KOH is a:

A
secondary amine
B
quaternary ammonium salt
C
tertiary amine
D
primary amine

Which of the following will not undergo Friedel-Crafts reaction?

A
Aniline
B
Toluene
C
Benzene
D
Chlorobenzene

The IUPAC name of the complex K₃[Cr(C₂O₄)₃] is:

A
Potassium trioxalatochromate(II)
B
Potassium tris(oxalato)chromate(III)
C
Potassium trioxalatochromate(III)
D
Potassium tris(oxalato)chromium(III)

The concentration of a reactant 'R' in a zero order reaction becomes half of its initial concentration after 100 s. The rate constant of the reaction is:

A
1.0 × 10⁻³ mol L⁻¹ s⁻¹
B
5.0 × 10⁻³ mol L⁻¹ s⁻¹
C
2.5 × 10⁻³ mol L⁻¹ s⁻¹
D
1.0 × 10⁻² mol L⁻¹ s⁻¹