CBSE Class 12 Chemistry Answer Key 2025; Download SET Wise Answer Key Here

As the CBSE Class 12 Chemistry Board Exam 2025 is successfully held, students must have started looking for the CBSE Class 12 Chemistry Answer Key 2025. As we all are very well known to the fact that that the official exam conducting authorities will not release any answer key, but our subject expert’s faculty have prepared the specially designed unofficial answer key for the questions asked in the CBSE Class 12th Chemistry Question Paper 2025. Students can now check the detailed exam analysis and set-wise CBSE Class 12 Chemistry Question Paper 2025 with the Answer Key in the article below.

CBSE Class 12 Chemistry Answer Key 2025 Out

The CBSE Class 12 Chemistry exam for all the Science stream students has been successfully conducted today, February 27, from 10:30 AM to 1:30 PM. The board does not release an official answer key but announces results directly. To help students, experts will prepare an unofficial CBSE Class 12 Chemistry Answer Key 2025 after the exam. This will help students check their answers and estimate their marks.

While it may not be completely accurate, it will give a good idea of their expected scores. Students can use this to review their performance and understand their mistakes. The full unofficial answer key will be shared soon in the article below. Students can refer to it to compare their responses and get an idea of their results before the official scores are declared.

CBSE Class 12th Chemistry Question Paper With Answers 2025 Set-1

Section A

Q1. The charge required for the reduction of 1 mol of MnO¯₄ to MnO₂ is

(A)1 F
(B) 3 F
(D) 5F
(D) 6 F

Answer: (B) 3 F

Q2. Which among the following is a false statement?

(A) Rate of zero order reaction is independent of initial concentration of reactant.
(B) Half-life of a zero order reaction is inversely proportional to the rate constant.
(C) Molecularity of a reaction may be zero.
(D) For a first-order reaction, t1/2= 0.693/k.

Answer: (C) Molecularity of a reaction may be zero.

Q3. The number of molecules that react with each other in an elementary reaction is a measure of the

(A) the activation energy of the reaction
(B) stoichiometry of the reaction
(C) the molecularity of the reaction
(D) order of the reaction

Answer: (C) molecularity of the reaction.

Q4. The element having [Ar]3d₁₀4s² electronic configuration is

(A) Cu
(B) Zn
(C) Cr
(D) Mn

Answer: (B) Zn

Q5. The complex ions [Co(NH₃)₅(NO₂)]²⁺ and [Co(NH₃)₅(ONO)]²⁺ are called

(A) Ionization isomers
(B) Linkage isomers
(C) Co-ordination isomers
(D) Geometrical isomers

Answer: (B) Linkage isomers.

Q6. The diamagnetic species is:

(A) [Ni(CN)4]2-
(B) [NiCl4]2−
(C) [Fe(CN)6]3−
(D) [CoF6]3−

Answer: (A) [Ni(CN)4]2-

Q7. Which is the correct IUPAC name for the given compound?

(A) Methylchlorobenzene
(B) Toluene
(C) 1-Chloro-4-Methylbenzene
(D) 1-Methyl-4-Chlorobenzene

Answer: (C) 1-Chloro-4-Methylbenzene

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

(A) Aldehyde
(B) Ketone
(C) Carboxylic acid
(D) Ester

Answer: (B) Ketone.

Q9. 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

Answer: (C) Kolbe reaction

Q10. 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)

Answer: (D) Both (A) and (B)

Q11. Nucleotides are joined together by

(A) Glycosidic linkage
(B) Peptide linkage
(C) Hydrogen bonding
(D) Phosphodiester linkage

Answer: (D) Phosphodiester linkage

12. Scurvy is caused due to deficiency of

(A) Vitamin B1
(B) Vitamin B2
(C) Ascorbic acid
(D) Glutamic acid

Answer: (C) Ascorbic acid

For questions numbers 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C), and (D) as given below:

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

Q13. Assertion (A): In a first-order reaction, if the concentration of the reactant is doubled, its half-life is also doubled.
Reason (R): The half-life of a reaction does not depend upon the initial concentration of the reactant in a first-order reaction.

Answer: (D) Assertion (A) is false, but Reason (R) is true.

Q14. Assertion (A): Cu cannot liberate H2 in reaction with dilute mineral acids.
Reason (R): Cu has a positive electrode potential.

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

Q15. Assertion (A): Aromatic primary amines cannot be prepared by Gabriel Phthalimide synthesis.
Reason (R): Aryl halides do not undergo nucleophilic substitution reaction with the anion formed by phthalimide.

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

Q16. Assertion (A): Vitamin D cannot be stored in our body.
Reason (R): Vitamin D is a fat-soluble vitamin and is not excreted from the body in urine.

Answer: (D) Assertion (A) is false, but Reason (R) is true.

CBSE 12th Chemistry Answer Sheet 2025 – Download PDF for All Sets

After successful completion of the 12th Chemistry Board exam, the CBSE Class 12th Chemistry Question Paper 2025 along with the Answer Key PDF for sets A, B, C, and D has been available here. This answer key will help students check their answers, but it may not always be completely accurate.

It is important to cross-check with official sources to be sure of the correct answers. Students are advised to use the unofficial answer key as a reference but they must rely on official updates for final confirmation. All the students who appeared for the Class 12th Chemistry Board Exam can now check the complete CBSE Class 12th Chemistry Answer Key 2025 PDF from the direct link that has been shared in our article

CBSE Class 12th Chemistry Question Paper Analysis 2025

The CBSE Class 12 Chemistry Board Exam 2025 has been successfully conducted. Now, we have provided a detailed analysis of the CBSE Class 12th Chemistry Question Paper below. This analysis includes important details about the exam, such as the types of questions asked, their difficulty level, and key topics covered. It will help them review their performance and prepare for future exams.

Teachers Reviews:

• After the completion of the CBSE Class 12th Chemistry exam, the teachers appreciated the exam pattern and found it fair.
• The questions matched the CBSE syllabus well.
• Case-based and reasoning questions tested understanding, not memorization.
• Students who studied NCERT books and past papers found it manageable.
• The paper was well-balanced, covering all topics properly.
• It was neither too difficult nor too easy.
• The pattern encouraged logical thinking and concept-based learning.
• Overall, teachers felt it was student-friendly and helpful.

Students Reviews:

• Students who practiced NCERT questions found organic chemistry easy.
• Physical chemistry had tricky numerical problems that needed careful solving.
• Assertion-reasoning and case-based questions checked understanding and thinking skills.
• Many students felt the CBSE Class 12th Chemistry exam was long, so managing time well was important.

Steps to Calculate Marks Using CBSE Class 12 Chemistry Answer Key 2025

Step 1: Click on the direct link (to be shared soon) to download the CBSE Class 12 Chemistry Answer Key 2025 PDF and make sure to keep your chemistry question paper ready.

Step 2: Check your answers by matching them with the ones given in the answer key.

Step 3: Give yourself marks for each correct answer and deduct marks for wrong ones, if needed, as per the marking rules.

Step 4: Add up all the marks to estimate your total score after reviewing all answers.

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