CBSE Class 12 Chemistry 2023 question paper (56/2)

1. A.
   a substitution reaction
2. B.
   an addition reaction
3. C.
   a dehydrohalogenation reaction
4. D.
   a dehydration reaction

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1. A.
   + 2
2. B.
   0
3. C.
   + 3
4. D.
   + 5

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1. A.
   $\mathrm{C_6H_5NH_2}$
2. B.
   $p\text{-}\mathrm{CH_3C_6H_4NH_2}$
3. C.
   $\mathrm{C_6H_5CH_2NH_2}$
4. D.
   $p\text{-}\mathrm{O_2NC_6H_4NH_2}$

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1. A.
   $\dfrac{+\mathrm{k}}{2.303}$
2. B.
   $-\mathrm{k}$
3. C.
   $\dfrac{-\mathrm{k}}{2.303}$
4. D.
   $+\mathrm{k}$

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1. A.
   Sucrose
2. B.
   Polypeptides
3. C.
   Nucleotides
4. D.
   Starch

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1. A.
   $\mathrm{S_N}1$ reaction
2. B.
   $\mathrm{S_N}2$ reaction
3. C.
   Neither $\mathrm{S_N}1$ nor $\mathrm{S_N}2$ reaction
4. D.
   $\mathrm{S_N}2$ reaction as well as $\mathrm{S_N}1$ reaction

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1. A.
   increases with decrease in temperature.
2. B.
   decreases with increase in temperature.
3. C.
   increases with increase in temperature.
4. D.
   remains constant.

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1. A.
   0.01 M
2. B.
   1 M
3. C.
   0.5 M
4. D.
   0.1 M

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1. A.
   $\mathrm{CH_3CH_2Br} + \mathrm{Na^+\,O^-C(CH_3)_3} \rightarrow \mathrm{CH_3CH_2-O-C\,(CH_3)_3}$
2. B.
   $\mathrm{(CH_3)_3\,C-Cl} + \mathrm{Na^+\,O^-\,CH_2CH_3} \rightarrow \mathrm{CH_3CH_2-O-C(CH_3)_3}$
3. C.
   Both (a) and (b)
4. D.
   Neither (a) nor (b)

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1. A.
   $\mathrm{HCHO}$
2. B.
   $\mathrm{CH_3CHO}$
3. C.
   $\mathrm{CH_3COCH_3}$
4. D.
   $\mathrm{CH_3COC_2H_5}$

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1. A.
   $\mathrm{CH_3-CHO}$
2. B.
   $\mathrm{C_6H_{11}CHO}$
3. C.
   $\mathrm{C_6H_5CHO}$
4. D.
   $\mathrm{CH_3COCH_3}$

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1. A.
   $\dfrac{-3}{2}\,\dfrac{\mathrm{d[A]}}{\mathrm{dt}}$
2. B.
   $\dfrac{-2}{3}\,\dfrac{\mathrm{d[A]}}{\mathrm{dt}}$
3. C.
   $\dfrac{-1}{3}\,\dfrac{\mathrm{d[A]}}{\mathrm{dt}}$
4. D.
   $+\dfrac{2\mathrm{d[A]}}{\mathrm{dt}}$

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1. A.
   Paramagnetic nature
2. B.
   Colour of hydrated ions
3. C.
   High enthalpy of atomisation
4. D.
   Variable oxidation states

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1. A.
   $\mathrm{[Pt\,Cl_2(en)_2\,(NO_3)_2]}$
2. B.
   $\mathrm{[Pt\,Cl_2(en)_2]\,(NO_3)_2}$
3. C.
   $\mathrm{[Pt\,Cl_2(en)_2\,(NO_3)]NO_3}$
4. D.
   $\mathrm{[Pt\,(en)_2\,(NO_3)_2]Cl_2}$

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

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

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

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

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1. A.
   $\mathrm{CH_2 = CHCH_2CH_2Cl}$
2. B.
   $\mathrm{CH_2 = C(Br)-CH_3}$
3. C.
   $\mathrm{CH_2 = CH - CH_2 - Br}$
4. D.
   $\mathrm{CH \equiv C - Br}$

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1. A.
   6
2. B.
   4
3. C.
   2
4. D.
   8

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1. A.
   Diazotisation reaction
2. B.
   Condensation reaction
3. C.
   Coupling reaction
4. D.
   Acetylation reaction

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1. A.
   $\dfrac{+\mathrm{k}}{2.303}$
2. B.
   $-\mathrm{k}$
3. C.
   $\dfrac{-\mathrm{k}}{2.303}$
4. D.
   $+\mathrm{k}$

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1. A.
   Nucleic acids
2. B.
   Amino acids
3. C.
   Monosaccharides
4. D.
   Amines

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1. A.
   $\mathrm{S_N}1$ reaction
2. B.
   $\mathrm{S_N}2$ reaction
3. C.
   Neither $\mathrm{S_N}1$ nor $\mathrm{S_N}2$ reaction
4. D.
   $\mathrm{S_N}2$ reaction as well as $\mathrm{S_N}1$ reaction

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1. A.
   shows a negative deviation from Raoult's law
2. B.
   forms an ideal solution
3. C.
   shows a positive deviation from Raoult's law
4. D.
   is saturated

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1. A.
   0.01 M
2. B.
   1 M
3. C.
   0.5 M
4. D.
   0.1 M

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1. A.
   $\mathrm{(CH_3)_3\,C-CHO}$
2. B.
   $\mathrm{(CH_3)_2\,CH-CHO}$
3. C.
   $\mathrm{C_6H_5CHO}$
4. D.
   $\mathrm{HCHO}$

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1. A.
   $\mathrm{CH_3CH_2Br} + \mathrm{Na^+\,O^-C(CH_3)_3} \rightarrow \mathrm{CH_3CH_2-O-C\,(CH_3)_3}$
2. B.
   $\mathrm{(CH_3)_3\,C-Cl} + \mathrm{Na^+\,O^-\,CH_2CH_3} \rightarrow \mathrm{CH_3CH_2-O-C(CH_3)_3}$
3. C.
   Both (a) and (b)
4. D.
   Neither (a) nor (b)

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1. A.
   hydrazones
2. B.
   cyanohydrins
3. C.
   semicarbazones
4. D.
   Oxime

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1. A.
   $\dfrac{+3}{2}\,\dfrac{\mathrm{d[B]}}{\mathrm{dt}}$
2. B.
   $\dfrac{+2}{3}\,\dfrac{\mathrm{d[B]}}{\mathrm{dt}}$
3. C.
   $\dfrac{+1}{3}\,\dfrac{\mathrm{d[B]}}{\mathrm{dt}}$
4. D.
   $+\dfrac{2\mathrm{d[B]}}{\mathrm{dt}}$

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1. A.
   $\mathrm{[Pt\,Cl_2(en)_2\,(NO_3)_2]}$
2. B.
   $\mathrm{[Pt\,Cl_2(en)_2]\,(NO_3)_2}$
3. C.
   $\mathrm{[Pt\,Cl_2(en)_2\,(NO_3)]NO_3}$
4. D.
   $\mathrm{[Pt\,(en)_2\,(NO_3)_2]Cl_2}$

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1. A.
   Fe
2. B.
   Mn
3. C.
   Zn
4. D.
   Cu

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

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

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

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

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1. A.
   Tear gas
2. B.
   Mustard gas
3. C.
   Phosgene gas
4. D.
   Chlorine gas

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1. A.
   $\mathrm{CO}$
2. B.
   $\mathrm{NO_2}$
3. C.
   $\mathrm{NH_3}$
4. D.
   $\mathrm{H_2O}$

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1. A.
   $\mathrm{C_6H_5NH_2}$
2. B.
   $\mathrm{C_6H_5CH_2NH_2}$
3. C.
   $p\text{-}\mathrm{CH_3C_6H_4NH_2}$
4. D.
   $p\text{-}\mathrm{O_2NC_6H_4NH_2}$

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1. A.
   $\dfrac{+\,\mathrm{k}}{2.303}$
2. B.
   $+\,\mathrm{k}$
3. C.
   $\dfrac{-\,\mathrm{k}}{2.303}$
4. D.
   $-\,\mathrm{k}$

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1. A.
   Gluconic acid
2. B.
   n-hexane
3. C.
   Saccharic acid
4. D.
   Iodohexane

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1. A.
   $\mathrm{S_N}2$ reaction
2. B.
   $\mathrm{S_N}1$ reaction
3. C.
   Neither $\mathrm{S_N}2$ nor $\mathrm{S_N}1$ reaction
4. D.
   $\mathrm{S_N}1$ as well as $\mathrm{S_N}2$ reaction

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1. A.
   Pressure
2. B.
   Temperature
3. C.
   Volume
4. D.
   Number of solute molecules

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1. A.
   $\mathrm{R} = \dfrac{1}{\mathrm{k}}\left(\dfrac{l}{\mathrm{a}}\right)$
2. B.
   $\mathrm{G} = \mathrm{k}\left(\dfrac{\mathrm{a}}{l}\right)$
3. C.
   $\mathrm{G} = \mathrm{k}\left(\dfrac{l}{\mathrm{a}}\right)$
4. D.
   $\Lambda_\mathrm{m} = \dfrac{\mathrm{k}}{\mathrm{c}}$

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1. A.
   2, 4-dinitrophenyl hydrazine
2. B.
   aqueous $\mathrm{NaHSO_3}$
3. C.
   Fehling solution
4. D.
   $\mathrm{I_2}$ and NaOH

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1. A.
   $\mathrm{CH_3CH_2Br} + \mathrm{Na^+\,O^-C(CH_3)_3} \rightarrow \mathrm{CH_3CH_2-O-C\,(CH_3)_3}$
2. B.
   $\mathrm{(CH_3)_3\,C-Cl} + \mathrm{Na^+\,O^-\,CH_2CH_3} \rightarrow \mathrm{CH_3CH_2-O-C(CH_3)_3}$
3. C.
   Both (a) and (b)
4. D.
   Neither (a) nor (b)

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1. A.
   $\mathrm{C_6H_5CHO}$
2. B.
   $\mathrm{CH_3CH_2CHO}$
3. C.
   $\mathrm{(CH_3)_3C-CHO}$
4. D.
   $\mathrm{H-CHO}$

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1. A.
   $\dfrac{+3}{2}\,\dfrac{\mathrm{d[B]}}{\mathrm{dt}}$
2. B.
   $\dfrac{+2}{3}\,\dfrac{\mathrm{d[B]}}{\mathrm{dt}}$
3. C.
   $\dfrac{+1}{3}\,\dfrac{\mathrm{d[B]}}{\mathrm{dt}}$
4. D.
   $\dfrac{+1}{2}\,\dfrac{\mathrm{d[B]}}{\mathrm{dt}}$

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1. A.
   Mn
2. B.
   Zn
3. C.
   Sc
4. D.
   Cu

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1. A.
   $\mathrm{Fe_2\,[Fe(CN)_6]_3}$
2. B.
   $\mathrm{Fe_4\,[Fe(CN)_6]_3}$
3. C.
   $\mathrm{Fe\,[Fe(CN)_6]}$
4. D.
   $\mathrm{Fe_3\,[Fe(CN)_6]_2}$

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

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

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

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

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