CBSE Class 12 Chemistry 2025 question paper (56/7)

1. A.
   $\mathrm{Cu^{+}}$
2. B.
   $\mathrm{Ni^{2+}}$
3. C.
   $\mathrm{Co^{2+}}$
4. D.
   $\mathrm{V^{3+}}$

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1. A.
   1% $\mathrm{KCl}$
2. B.
   1% glucose
3. C.
   1% urea
4. D.
   1% $\mathrm{CaCl_2}$

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1. A.
   $\mathrm{H_2}$ gas
2. B.
   $\mathrm{O_2}$ gas
3. C.
   $\mathrm{SO_2}$ gas
4. D.
   $\mathrm{SO_3}$ gas

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1. A.
   $\ln \mathrm{k}$ vs. $\mathrm{T}$
2. B.
   $\frac{\ln \mathrm{k}}{\mathrm{T}}$ vs. $\mathrm{T}$
3. C.
   $\ln \mathrm{k}$ vs. $\frac{1}{\mathrm{T}}$
4. D.
   $\frac{\mathrm{T}}{\ln \mathrm{k}}$ vs. $\frac{1}{\mathrm{T}}$

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1. A.
   $\frac{-\mathrm{E_a}}{\mathrm{RT}}$
2. B.
   $e^{-\mathrm{E_a}/\mathrm{RT}}$
3. C.
   $e^{+\mathrm{E_a}/\mathrm{RT}}$
4. D.
   $\frac{+\mathrm{E_a}}{\mathrm{RT}}$

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1. A.
   0
2. B.
   1
3. C.
   2
4. D.
   3

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1. A.
   2-Chlorobutane
2. B.
   1-Bromobutane
3. C.
   2-Bromo-2-Methylpropane
4. D.
   2,2-Dimethyl-1-Chloropropane

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1. A.
   Acidic
2. B.
   Basic
3. C.
   Neutral
4. D.
   Amphoteric

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1. A.
   2,4,6-tribromophenol
2. B.
   $p$-bromophenol
3. C.
   $o$-and $p$-bromophenol
4. D.
   2,4-dibromophenol

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1. A.
   Tertiary amine
2. B.
   Quaternary ammonium salt
3. C.
   Secondary amine
4. D.
   Primary amine

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1. A.
   $\mathrm{CH_3-NH_2}$
2. B.
   $\mathrm{(CH_3)_2NH}$
3. C.
   $\mathrm{(CH_3)_3N}$
4. D.
   $\mathrm{C_6H_5-NH-CH_3}$

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1. A.
   primary structure of protein
2. B.
   secondary structure of protein
3. C.
   tertiary structure of protein
4. D.
   quaternary structure of protein

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

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

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

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

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1. A.
   $\mathrm{3d^6\ 4s^2}$
2. B.
   $\mathrm{3d^5\ 4s^1}$
3. C.
   $\mathrm{3d^5\ 4s^2}$
4. D.
   $\mathrm{3d^3\ 4s^2}$

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1. A.
   1% KCl
2. B.
   1% glucose
3. C.
   1% urea
4. D.
   1% $\mathrm{CaCl_2}$

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1. A.
   $\Lambda_m = \Lambda_m^{\circ}$ as $\mathrm{C} \longrightarrow 1$
2. B.
   $\Lambda_m = \Lambda_m^{\circ}$ as $\mathrm{C} \longrightarrow 0$
3. C.
   $\Lambda_m = \Lambda_m^{\circ}$ as $\mathrm{C} \longrightarrow \infty$
4. D.
   $\Lambda_m = \Lambda_m^{\circ}$ as $\mathrm{C} \longrightarrow \sqrt{\mathrm{A}}$

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1. A.
   $\mathrm{s^{-1}}$
2. B.
   $\mathrm{mol\ L^{-1}\ s^{-1}}$
3. C.
   $\mathrm{mol^{-1}\ L\ s^{-1}}$
4. D.
   $\mathrm{mol^{-2}\ L\ s^{-1}}$

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1. A.
   $\frac{-\mathrm{E_a}}{\mathrm{RT}}$
2. B.
   $e^{-\mathrm{E_a}/\mathrm{RT}}$
3. C.
   $e^{+\mathrm{E_a}/\mathrm{RT}}$
4. D.
   $\frac{+\mathrm{E_a}}{\mathrm{RT}}$

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1. A.
   1
2. B.
   0
3. C.
   2
4. D.
   3

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1. A.
   Finkelstein reaction
2. B.
   Swarts reaction
3. C.
   Sandmeyer reaction
4. D.
   Wurtz reaction

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1. A.
   $1^{\circ} < 2^{\circ} < 3^{\circ}$
2. B.
   $2^{\circ} < 1^{\circ} < 3^{\circ}$
3. C.
   $3^{\circ} > 1^{\circ} < 2^{\circ}$
4. D.
   $1^{\circ} > 2^{\circ} > 3^{\circ}$

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1. A.
   2,4-dibromophenol
2. B.
   2-bromophenol
3. C.
   2,4,6-tribromophenol
4. D.
   4-bromophenol

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1. A.
   Primary amine
2. B.
   Secondary amine
3. C.
   Tertiary amine
4. D.
   A mixture of amines

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1. A.
   $\mathrm{(CH_3)_2-NH}$
2. B.
   $\mathrm{(CH_3)_3N}$
3. C.
   $\mathrm{CH_3-CH_2-NH_2}$
4. D.
   $\mathrm{C_6H_5-NH_2}$

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1. A.
   Vitamin A
2. B.
   Vitamin $\mathrm{B_2}$
3. C.
   Vitamin C
4. D.
   Vitamin D

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

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

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

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

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1. A.
   first increases and then decreases
2. B.
   increases continuously
3. C.
   first decreases and then increases
4. D.
   remains constant

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1. A.
   1% KCl
2. B.
   1% glucose
3. C.
   1% urea
4. D.
   1% $\mathrm{CaCl_2}$

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1. A.
   Copper electrodes
2. B.
   Platinum electrodes
3. C.
   Zinc electrodes
4. D.
   Iron electrodes

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1. A.
   $+\,\mathrm{k}$
2. B.
   $\frac{+\,\mathrm{k}}{2{\cdot}303}$
3. C.
   $-\,\mathrm{k}$
4. D.
   $\frac{-\,\mathrm{k}}{2{\cdot}303}$

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1. A.
   $\frac{-\mathrm{E_a}}{\mathrm{RT}}$
2. B.
   $e^{-\mathrm{E_a}/\mathrm{RT}}$
3. C.
   $e^{+\mathrm{E_a}/\mathrm{RT}}$
4. D.
   $\frac{+\mathrm{E_a}}{\mathrm{RT}}$

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1. A.
   0
2. B.
   3
3. C.
   6
4. D.
   4

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1. A.
   $\mathrm{CH_3-CH_2-I}$
2. B.
   $\mathrm{CH_3-CH_2-Br}$
3. C.
   $\mathrm{CH_3-CH_2-Cl}$
4. D.
   $\mathrm{CH_3-CH_2-F}$

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1. A.
   Basic
2. B.
   Neutral
3. C.
   Acidic
4. D.
   Amphoteric

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1. A.
   Salicylic acid
2. B.
   Picric acid
3. C.
   Benzoic acid
4. D.
   Phthalic acid

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1. A.
   2-aminobenzene sulphonic acid
2. B.
   benzene sulphonic acid
3. C.
   2-aminobenzoic acid
4. D.
   sulphanilic acid

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1. A.
   $\mathrm{CH_3-CH_2-NH_2}$
2. B.
   $\mathrm{CH_3-CH(CH_3)-CH_2-NH_2}$
3. C.
   $\mathrm{(CH_3-CH_2)_3N}$
4. D.
   $\mathrm{C_6H_5-NH_2}$

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1. A.
   Convulsions
2. B.
   Beri-Beri
3. C.
   Fissuring at corners of mouth and lips (Cheilosis)
4. D.
   Muscular weakness

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

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

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

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

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