CBSE Class 12 Chemistry Answer Key 2025: Set-wise Unofficial Key PDF, Exam Analysis

CBSE Class 12 Chemistry Answer Key 2025: The CBSE Class 12 Chemistry exam was conducted on February 27, 2025, in offline mode. The exam was conducted for a total of 3 hours duration. The total marks for the theory exam was 70. The Chemistry paper for CBSE class 12 Exam 2025 was divided into 5 sections: A, B, C, D, and E. Section A consisted of MCQ questions, section B consisted of very short answer questions, section C consisted of short answer questions, section D consisted of case-based questions, and section E consisted of long answer questions. The marking scheme differs depending on the type of questions.

The candidates can check below the set-wise CBSE Class 12 Chemistry Answer Key 2025 along with the question paper and exam analysis.

CBSE Class 12 Chemistry Exam 2025 Difficulty Level: Student Reaction

We have updated here the students' reaction to CBSE Class 12 Chemistry exam:

• The overall difficulty level of the exam was moderate.
• MCQ questions were direct. However, some of the questions were based on calculations and were time-consuming.
• The short answer questions were easy to moderate. Most of the questions were not time-consuming.
• The difficulty level of the Case-Based Questions was also moderate. 
• Students found the long answer questions a bit lengthy. Most of the students were not able to answer all the questions within time.
• The diagram-based questions were time-consuming.

CBSE Class 12 Chemistry Exam Analysis 2025

The below table overviews the complete CBSE Class 12 Chemistry Answer Key 2025 exam analysis:

Particulars	Analysis
Overall Difficulty Level	Moderate
Difficulty Level of Section A	Easy to moderate
Difficulty Level of Section B	Easy to moderate
Difficulty Level of Section C	Easy to moderate
Difficulty Level of Section D	Moderate
Difficulty Level of Section E	Moderate to tough
Topics with Highest Weightage in Exam	Aldehydes, Ketones and Carboxylic Acids
Expected Number of Good Attempts	55+

CBSE Class 12 Chemistry Answer Key 2025 PDF

We have updated the unofficial answer key for CBSE Class 12 Chemistry exam below. The candidates can also download the CBSE Class 12 Chemistry answer key in PDF form by clicking on the link below:

Q.1

Ans: Option C (5F)

Q.2

Ans: Option A (Rate of zero order reaction is independent of initial concentration of reactant)

Q.3 The number of molecules that react with each other in an elementary reaction is a measure of the:

(A) Activation energy of the reaction

(B) Stoichiometry of the reaction

(C) Molecularity of the reaction

(D) Order of the reaction

Ans: Option C (Molecularity of the reaction)

Q.4 The element having electronic configuration is:

(A) Cu

(B) Zn

(C) Cr

(D) Mn

Ans: Option A (Cu)

Q.5

Ans: Option B (Linkage Isomers)

Q.6

Ans: Option A

Q.7

Ans: Option C (1-Chloro-4-Methylbenzene)

Q.8 What will be formed after oxidation reaction of secondary alcohol with chromic anhydride (CrO3)?

(A) Aldehyde

(B) Ketone

(C) Carboxylic acid

(D) Ester

Ans: Option B (Ketone)

Q.9 The conversion of phenol to salicylic acid can be accomplished by

(A) Reimer-Tiemann reaction

(B) Friedel-Crafts reaction

(C) Kolbe reaction

(D) Coupling reaction

Ans: Option C (Kolbe reaction)

Q.10 Which of the following is/ are examples of denaturation of protein?

(A) Coagulation of egg white

(B) Curdling of milk

(C) Clotting of blood

(D) Both (A) and (B)

Ans: Option D (Both (A) and (B))

Q.11 Nucleotides are joined together by

(A) Glucosidic linkage

(B) Peptide linkage

(C) Hydrogen bonding

(D) Phosphodiester linkage

Ans: Option D (Phosphodiester linkage)

Q.12 Scurvy is caused due to deficiency of

(A) Vitamin B1

(B) Vitamin B2

(C) Ascorbic acid

(D) Glutamic acid

Ans: Option C (Ascorbic acid, also known as Vitamin C)

Q.13 to 16:

Q.13

Ans: Option C (Assertion (A) is true, but Reason (R) is false)

Q.14

Ans: Option A (Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A))

Q.15

Ans: Option A (Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A))

Q.16

Ans: Option D (Assertion (A) is false, but Reason (R) is true)

CBSE Class 12 Chemistry Unofficial Answer Keys 2025 PDF

CBSE Class 12 Chemistry Question Paper 2025 PDF

We will update the CBSE Class 12 Chemistry question paper below anytime soon. The candidates can also download the question paper for CBSE Class 12 Chemistry in PDF form by clicking on the link below:

CBSE Class 12 Chemistry Question Paper 2025: To be Updated