CBSE Chemistry Answer Key 2025
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Today is CBSE Class 12 Chemistry paper. As usual, we will provide you Chemistry Answer Key just after the exam.
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Now, we provide you CBSE Class 12 Chemistry Answer Key 2025. The paper of Chemistry has ended on 1:30 PM today on 25.02.2025.
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Chemistry Answer Key 2025 Code 56/6/1 Set -1
Q.1 Williamson synthesis of preparing unsymmetrical either is:
Answer: Option (B) – SN2 reaction
Q.2 Which of the following compounds would be hydrolysed by aqueous KOH most easily?
Answer: Option (D) – CH2 = CH – CH2 – Br
Q.3 According to Werner’s theory of coordination compounds:
Answer: Option (A) – Primary valences are ionisable
Q.4 Which of the following complex ion is not optically active?
Answer: Option (C) – trans – [Co(en)2Cl2]+
Q.5 Which of the following is the softest metal?
Answer: Option (A) – Zn
Q.6 In the Hinsberg’s method for separation of primary, secondary and tertiary amines, the reagent used is:
Answer: Option(C)——-SO2Cl
Q.7 Which one of the following amines given an alcohol on reaction with HNO2?
Answer: Option (B) – C2H5NH2
Q.8 The freezing point of one molal KCI solution, assuming KCI to be completely dissociated in water is:
Answer: Option (A) – (-3.72 C)
Q.9 A solution of acetone in ethanol:
Answer: Option (C) – Shows a positive deviation from Raoult’s Law
Q.10 Which of the following cell converts the energy of combustion of fuel into electrical energy?
Answer: Option (B) – Fuel Cell
Q.11 The unit of rate and rate constant are same for a:
Answer: Option (C) – Zero order reaction
Q.12 Pyranose ring of glucose is formed due to the reaction between:
Answer: Option (B) – C1 and C5
Q.13 Assertion (A): Actinoids show wide range of oxidation states.
Reason (R): Actinoids are radioactive in nature.
Answer: Option (B) – Both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
Q.14 Assertion (A): Hydrolysis of an ester follows first order kinetics.
Reason (R): The concentration of water does not get altered much during the reaction.
Answer: Option (A) – Both Assertion and Reason are true but Reason is the correct explanation of the Assertion.
Q.15 Assertion (A): Boiling point of (CH3)3N is higher than that of CH3CH2CH2NH2.
Reason (R): Hydrogen bonding is more extensive in CH3CH2CH2NH2.
Answer: Assertion is false but Reason is true
Q.16 Assertion (A): Phenol is strongly acidic as compared to ethanol.
Reason (R): Phenoxide ion is more stable than ethoxide ion.
Answer: Option (A) – Both Assertion and Reason are true but Reason is the correct explanation of the Assertion.
Chemistry Answer Key 2025 Code 56/6/2 Set-2
Q.1 Which by-product is obtained in the manufacture of phenol from cumene?
Answer: Option (B) – Acetone
Q.2 Which reagents are required for one step conversion of chlorobenzene to toluene?
Answer: Option (D) – CH3Cl, Na, Dry ether
Q.3 Coordination number of Fe in [Fe(C2O4)3]3- is:
Answer: Option (A) – 6
Q.4 Which of the following complexes show geometrical isomerism?
Answer: Option (C) – [Co(NH3)4Cl2]+
Q.5 Which of the following does not show variable oxidation state?
Answer: Option (A) – Sc
Q.6 The reagent that can be used to convert benzenediazonium choloride to benzene is:
Answer: Option (C) – CH3CH2OH
Q.7 The gas evolved when methylamine reacts with HNO2 is:
Answer: Option (B) – N2
Q.8 A solution of acetone in chloroform:
Answer: Option (D) – shows a negative deviation from Raoult’s Law
Q.9 The freezing point of one molal KCI solution, assuming KCI to be completely dissociated in water, is (Kf for water = 1.86 K kg mol-1)
Answer: Option (A) – (-3.72 C)
Q.10 A galvanic cell can gehave like an electrolytic cell when:
Answer: Option (B) – Eext>Ecell
Q.11 The value of rate constant for a pseudo first order reaction:
Answer: Option (C) – depends on the concentration of reactants present in large excess
Q.12 Furanose ring of fructose is formed…………………………………………..
Answer: Option (B) – C2 and C5
Q.13 Assertion (A): Actinoids show wide range of oxidation states.
Reason (R): This is due to comparable energies of 5f, 6d and 7s orbitals.
Answer: Option (A) – Both Assertion and Reason are true but Reason is the correct explanation of the Assertion.
Q.14 Assertion (A): Order of the reaction can be zero or fractional.
Reason (R): We cannot determine order from balanced chemical equation.
Answer: Option (B) – Both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
Q.15 Assertion (A): Boiling point of (C2H5)2NH is lower than that of n-C4H9NH2.
Reason (R): Hydrogen bonding is much more extensive in n-C4H9NH2 as compared to (C2H5)2NH.
Answer: Option (A) – Both Assertion and Reason are true but Reason is the correct explanation of the Assertion.
Q.16 Assertion (A): Phenol is less acidic than alcohol.
Reason (R): Phenoxide ion is more stable than alkoxide ion.
Answer: Option (D) – Assertion is false but Reason is true.
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