CBSE 12 Chemistry Question Paper-2025 Set-6 by Pavan | Practice Test to Test Your Knowledge
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  3. CBSE 12 Chemistry Question Paper-2025 Set-6
CBSE 12 Chemistry Question Paper-2025 Set-6

CBSE 12 Chemistry Question Paper-2025 Set-6

This mock test includes actual CBSE Class 12 Chemistry board exam questions from the year 2025 set-6, helping students understand exam trends and practice real paper format

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

Duration

30 min

Questions

24

Marking

Negative

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Questions Preview

Which of the following complexes is homoleptic?

A
[Co(en)₂Cl₂]²⁺
B
[Co(NH₃)₅Cl]Cl₂
C
[Fe(CN)₆]³⁻
D
[Cr(NH₃)₄Cl₂]⁺

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

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

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

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

Which of the following molecules is chiral in nature?

A
1-chlorobutane
B
1-chloropropane
C
2-chlorobutane
D
2-chloropropane

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

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

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

A
Methoxypropane
B
Ethoxyethane
C
Methoxyethane
D
Ethoxypropane

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

A
Aniline
B
Benzene
C
Toluene
D
Chlorobenzene

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 is not a natural polymer?

A
Terylene
B
Cellulose
C
Rubber
D
Protein

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

For a chemical reaction, the rate constant is given by the expression, k = A e⁻ᴱᵃ/RT The rate of the reaction increases as:

A
Activation energy increases
B
Temperature decreases
C
Temperature increases
D
Activation energy increases and temperature decreases

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

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

Rate of reaction can be expressed in terms of change in concentration of reactant or product with time. Which of the following represents the rate of reaction for the given reaction? 2N₂O₅(g) → 4NO₂(g) + O₂(g)

A
-1/2 d[N₂O₅]/dt
B
1/4 d[NO₂]/dt
C
d[O₂]/dt
D
All of the above

The role of a catalyst is to change :

A
Gibbs energy of reaction
B
equilibrium constant
C
enthalpy of reaction
D
activation energy of reaction

The IUPAC name of the compound CH₃-CH₂-N(CH₃)-CH₂-CH₂-CH₃ is:

A
N,N-dimethylpropan-1-amine
B
N-methylpentan-2-amine
C
N-ethyl-N-methylpropan-1-amine
D
N,N-diethylpropan-1-amine

CH₃CH₂CHO and CH₃CH₂COOH can be distinguished by:

A
Hinsberg test
B
Iodoform test
C
Sodium bicarbonate test
D
Lucas test

CH₃CH₂OH can be converted to CH₃CHO by:

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

The boiling points of aldehydes and ketones are higher than hydrocarbons and ethers of comparable molecular masses due to:

A
Presence of hydrogen bonding
B
Presence of ionic bonds
C
Presence of van der Waals forces
D
Presence of dipole-dipole interactions

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
[Ni(CO)₄]
D
[Co(NH₃)₆]³⁺

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

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

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