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CBSE class 12 chemistry response keys 2025: The Central Board of Secondary Education (CBSE) carried out the 12 Business Studies class on February 27, 2025. After the exam, the students strive for their performance. To help you with this process, we state the reply key for all sentences of the question paper in PDF format.

CBSE class 12 chemistry answer key features

The use of the response key offers several advantages:

• Self -assessment: Helps to evaluate your performance and understanding chemical concepts.
• Clarification of doubts: Provide clear solutions for numerical and theoretical questions that you found as difficult.
• Preparation for future exams: Identify areas in which more exercise is needed and helps you to better prepare for the upcoming board and competition tests such as Neet and Jee.

CBSE class 12 chemical examination patterns 2025 key highlights

CBSE class 12 chemical testing

The CBSE chemistry test of CBSE class 12 usually consists of around 30-35 questions that vary depending on the latest pattern.

CBSE class 12. Chemistry response key 2025

Get the CBSE class 12. Chemistry keyword key 2025 here, which is curated by the experts. The students can access all questions that are asked in CBSE Class 12. Chemistry question paper 2025.

Section – a
16 × 1 = 16

Questions No. 1 to 16 are questions about the multiple -choice type, each bearing 1 brand.

1. The load required for the reduction of 1 mol MNO₄^–To mno₂ Is
(A) 1 f
(B) 3 f
(C) 5 f
(D) 6 F
Correct answer: (b) 3 f

2. Which among the following is a wrong statement?
(A) The speed of the reaction of zero order is independent of the initial concentration of the reactant.
(B) The half -life of a reaction with a zero order is reversed in proportion to the speed constant.
(C) The molecularity of a reaction can be zero.
(D) for a first order reaction, t_1/2= 0.693/k.
Correct answer: (c) molecularity of a reaction can be zero.

3. The number of molecules that react in an elementary reaction
(A) The activation energy of the reaction
(B) Stoichiometry of the reaction
(C) The molecularity of the reaction
(D) Order of the reaction
Correct answer: (c) molecularity of the reaction

4. The element has [Ar]3D₁₀4S² The electronic configuration is
(A) cu
(B) ZN
(C) cr
(D) mn
Correct answer: (b) ZN

5. The complex ions [Co(NH₃)₅(NO2)]²⁺And [Co(NH₃)₅(ONO)]²⁺ be named
(A) ionization -isomer
(B) link isomers
(C) Coordination isomers
(D) Geometric isomers
Correct answer: (b) linking size

6. The diamagnetic species is:
(A) [Ni(CN)₄]^2-
(B) [NiCl₄]^2-
(C) [Fe(CN)₆]^3-
(D) [CoF₆]^3-
Correct answer: (a) [Ni(CN)₄]^2-

7. What is the right IUPAC name for the specified connection?

(A) Methylchlobenzene
(B) Toluol
(C) 1-chlor-4-methylbenzene
(D) 1-methyl-4-chlobenzene
Correct answer: (C) 1-chlor-4-methylbenzene

8. What will be formed according to the oxidation reaction of secondary alcohol with chroman hydride (CRO)₃)?
(A) aldehyde
(B) ketone
(C) carboxylic acid
(D) ester
Correct answer: (B) ketone

9. The conversion of phenol into salicylic acid can be achieved by
(A) Reaction of the Reimer-Tiemann
(B) Friedel-Crafts reaction
(C) Kolbe reaction
(D) coupling reaction
Correct answer: (A) Reaction of the Reimer-Tiemann

10. Which of the following statements is/are examples of the denaturation of protein?
(A) coagulation of protein
(B) Milk wedge
(C) blood clotting
(D) Both (a) and (b)
Correct answer: (D) Both (a) and (b)

11. Nucleotides are assembled by
(A) glycosidic link
(B) Peptide link
(C) hydrogen bond
(D) Phosphodiest binding
Correct answer: (D) Phosphodiest binding

12. Scurvy is caused by a lack of deficiency
(A) vitamin B1
(B) Vitamin B2
(C) Ascorbic acid
(D) glutamic acid
Correct answer: (C) Ascorbic acid

Two statements are given for questions of questions of the questions of the questions of the questions of 13 to 16 – one with the claim (a) and the other called reason (r). Choose the correct answer to these questions from the codes (a), (b), (c) and (d) as indicated below:

(A) Both the claim (a) and reason (r) are true and reason (r) is the correct explanation of the claim (a).
(B) Both the claim (a) and reason (r) are true, but reason (r) is not the correct explanation of the claim (a).
(C) claim (a) is true, but reason (r) is wrong.
(D) claim (a) is wrong, but reason (r) is true.

13. Claim (a): In the event of a first order reaction, the half -life is also doubled if the focus of the reactant doubles.
Reason (r): The half -life of a reaction does not depend on the initial concentration of the reactant in a first order reaction.

Correct answer: (D) claim (a) is wrong, but reason (r) is true.

14. Claim (a): Cu cannot free H.₂ As a reaction with diluted mineral acids.
Reason (r): CU has a positive electrode potential.

Correct answer: (A) Both the claim (a) and reason (r) are true, and reason (r) is the correct explanation of the claim (a).

15. Claim (a): Aromatic primary amine cannot be produced by the Gabriel -phhthalimide synthesis.
Reason (r): Arylhalids are subjected to nucleophilic substitution reaction with the anion formed by phthalimide.

Correct answer: (A) Both the claim (a) and reason (r) are true, and reason (r) is the correct explanation of the claim (a).

16. Claim (a): Vitamin D cannot be stored in our body.
Reason (r): Vitamin D is a fat -soluble vitamin and is not excreted in the urine.

Correct answer: (D) claim (a) is wrong, but reason (r) is true.

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