Class 12 CBSE Chemistry Answer Key 2025 (OUT): Set-wise unofficial keys PDF download
For the exam being held on February 27, 2025, Class 12 CBSE Chemistry Answer Key 2025 have been provided here. As the exam is over, the unofficial Class 12 CBSE Chemistry Answer Key 2025 PDF for all sets can be accessed below.
Class 12 CBSE Chemistry Answer Key 2025: Soon after the Class 12 CBSE Chemistry 2025 exam concludes at 1:30 PM on February 27, 2025 , the Class 12 CBSE Chemistry Answer Key 2025 set-wise will be updated here. It shall be noted that answers to all the objective-type questions will be updated here and for the subjective-type questions, students should refer to their books for teachers for answers, as they are based on students' opinions. The question paper is divided into five sections carrying various marks, and all the questions are compulsory with internal alternative questions. However, the Section A, objective type questions will not have any alternative option questions, so, all answers to be attempted.
Also Read | Class 12 CBSE Result Expected Release Date 2025
Class 12 CBSE Chemistry Answer Key 2025
The unofficial answer key has been made available so students can evaluate their performance, spot errors, and be ready for future tests. The table below contains the unofficial CBSE Class 12 Chemistry 2025 answer key for candidates.
Section - A Multiple Choice Questions (QP Code- 56/2/1)
| Q. No. | Question (QP Code- 56/2/1) | Answers |
| 1 | The charge required for the reduction of 1 mol of MnO 4 - to MnO 2 is | 5 F |
| 2 |
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. | (C) Molecularity of a reaction may be zero. |
| 3 | The number of molecules that react with each other in an elementary reaction is a measure of the: | Molecularity of the reaction |
| 4 | The element having [Ar]3d 10 4s 1 electronic configuration is | Cu |
| 5 | The complex ions [Co(NH 3 ) 5 (NO 2 )] 2+ and [Co(NH 3 ) 5 (ONO)] 2+ are called | Linkage Isomers |
| 6 | The diamagnetic species is: | [Ni(CN) 4 ] 2- |
| 7 |
Which is the correct IUPAC name for:
| 1-Chloro-4-Methylbenzene |
| 8 | What will be formed after oxidation reaction of secondary alcohol with chromic anhydride (CrO 3 )? | Ketone |
| 9 | The conversion of phenol to salicylic acid can be accomplished by | Kolbe Reaction |
| 10 | Which of the following is/are examples of denaturation of protein? | Both (A) and (B) |
| 11 | Nucleotides are joined together by | Phosphodiester Linkage |
| 12 | Scurvy is caused due to deficiency of | Ascorbic Acid |
| 13 |
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. | Assertion is True, but Reason is False. |
| 14 |
Assertion (A):
Cu cannot liberate H
2
on reaction with dilute mineral acid.
Reason (R): Cu has positive electrode potential. | Both Assertion & Reason is True & Reason is correct explanation of Assertion. |
| 15 |
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. | Both Assertion & Reason is True & Reason is correct explanation of Assertion. |
| 16 |
Assertion (A):
Vitamin D cannot be stored in our body.
Reason (R): Vitamin D is fat-soluble vitamin and is not excreted from the body in urine | Assertion is False, but Reason is True. |
Section - A Multiple Choice Questions (QP Code- 56/5/3)
QP Number | Questions | Correct Answers |
1. | CH 3 CH 2 CHO and CH 3 CH 2 COOH can be distinguished by | Sodium bicarbonate test |
2 | While doing qualitative analysis in the chemistry lab, Abhishek added yellow coloured potassium chromate solution into a test tube. He was surprised to see the colour of the solution changing immediately to orange. He realised that the test tube was not clean and contained a few drops of the same liquid. Which of the following substances will be the most likely liquid to be present in the test tube before adding potassium chromate solution | HCL Solution |
| 3. | The role of a catalyst is to change | Activation energy of reaction |
| 4. |
Which of the following molecules is chiral in nature?
A. 1-chloropropane B. 2-chloropropane 3. 1-chlorobutane 4. 2-chlorobutane | Option 4. 2-chlorobutane |
| 5. | CH 3 C 2 OH can be converted to CH 3 CHO by: | Treatment with PCC |
| 6. | The IUPAC name for CH 3 -CH 2 -N(CH 3 )-CH 2 -CH 2 -CH 3 is: | N-ethyl-N-methylpropan-1-amine |
| 7. |
A plot between concentration of reactant [R] and time 't' is shown below. Which of the given order of reaction is indicated by the graph.
| Zero order |
| 8. | The treatment of ethyl bromide with alcoholic silver nitrite gives: | nitroethane |
| 9. | Which of the following aqueous will have the highest freezing point? | 1.0 MKCl |
| 10 | Which of the following aldehydes will undergo Cannizzaro reaction? | (CH 3 ) 3 C CHO |
| 11. | In which of the following groups are both ions coloured in aqueous solution? | CO 2+ and FE 2+ |
| 12. | Match the following of Column I with Column II: |
i. Lead Storage cell- d. Inverter
ii. Mercury Cell- c. Wrist watch iii. Dry cell- a. Wall clock iv. Fuel cell- b. Apollo Space Program |
Section - A Multiple Choice Questions (QP Code- 56/6/1)
QP Number | Questions | Correct Answers |
1. | Williamson Synthesis of preparing unsymmetrical ether is: | S N 2 reaction |
| 2. | Which of the following compounds would be hydrolysed by aqueous KOH most easily? | |
| 3. | According to Werner's theory of coordination compounds: | Primary valences are ionisable |
| 4. | Which of the following complex ion is not optically active? | trans-[Co(en) 2 Cl 2 ] + |
| 5. | Which of the following is the softest metal? | Zn |
| 6. | In the Hinsberg's method for separation of primary, secondary and tertiary amines, the reagent used is: | |
| 7. | Which of the following amines gives an alcohol on reaction with HNO 2 ? | C 2 H 5 NH 2 |
| 8. | The freezing point of one molal KCI olution, assuming KCI to be completely dissociated in water, is- | -3.72°C |
| 9. | A solution of aceton in ethanol | Shows a positive deviation from Raoult's law |
| 10. | Which of the following cell converts the energy of combustion of fuel into electrical energy? | Fuel Cell |
| 11. | The unit of rate and rate constant are same for a: | Zero order reaction |
| 12. | Pyranose ring of glucose is formed due to the reaction between: | C 1 and C 5 |
| 13. |
Assertion: Actinoids show wide range of oxidation states
Reason: Actinoids are radioactive in nature | Both A and R are true; but R is not the correct explanation of the A |
| 14. |
Assertion: Hydrolysis of an ester follows first order kinetics
Reason: The concentration of water does not get altered much during the reaction | Both A and R are true; but R is not the correct explanation of the A |
| 15. |
Assertion: Boiling point of (CH
3
)
3
N is higher than that of CH
3
CH
2
CH
2
NH
2
Reason: Hydrogen bonding is more extensive in CH 3 CH 2 CH 2 NH 2 | A is true but R is false |
| 16. |
Assertion: Phenol is strongly acidic as compared to ethanol
Reason: Phenoxide ion is more stable than ethoxide ion | A is false but R is true |
Class 12 CBSE Chemistry Exam Analysis 2025 Link
Students can tap on the link to access the Class 12 CBSE Chemistry exam analysis 2025 and review their exam performance.
Class 12 CBSE Subject-Wise Answer Key 2025 |
| Subject Name | Answer Key Links |
| Physics | Class 12 CBSE Physics Answer Key 2025 |
| Entrepreneurship | Class 12 CBSE Entrepreneurship Answer Key 2025 |
| Physical Education | Class 12 CBSE Physical Education Answer Key 2025 |
| Business Studies | Class 12 CBSE Business Studies Answer Key 2025 |
| Geography | Class 12 CBSE Geography Answer Key 2025 |
| Mathematics | Class 12 CBSE Mathematics Answer Key 2025 |
| English Core | Class 12 CBSE English Answer Key 2025 |
| Hindi | CBSE Class 12 Hindi Answer Key 2025 |
| Economics | Class 12 CBSE Economics Answer Key 2025 |
| Political Science | Class 12 CBSE Political Science Answer Key 2025 |
| Biology | Class 12 CBSE Biology Answer Key 2025 |
| Accountancy | Class 12 CBSE Accountancy Answer Key 2025 |
| Sociology | Class 12 CBSE Sociology Answer Key 2025 |
| Information Technology | Class 12 CBSE Information Technology Answer Key 2025 |
| Computer Science | Class 12 CBSE Computer Science Answer Key 2025 |
| Informatics Practices | Class 12 CBSE Informatics Practices Answer Key 2025 |
| History | Class 12 CBSE History Answer Key 2025 |
Class 12 CBSE Toughest and Easiest Subject 2025 |
| Parameters | Links |
| Toughest Subject | Toughest Subject of CBSE Class 12 Exams 2025 |
| Easiest Subject | Easiest Subject of CBSE Class 12 Exams 2025 |
Stay tuned to the LIVE blog for more updates on Class 12 CBSE Chemistry Answer Key 2025.
Class 12 CBSE Chemistry Answer Key 2025 Live Updates
Feb 27, 2025 07:00 PM IST
CBSE Class 12 Chemistry Unofficial Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: Assertion (A): Cu cannot liberate H2 on reaction with dilute mineral acid.
Reason (R): Cu has positive electrode potential.Answer: Both Assertion & Reason is True & Reason is correct explanation of Assertion.
Feb 27, 2025 06:40 PM IST
CBSE 12th Chemistry 2025 Answer Key: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: 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: Assertion is True, but Reason is False.
Feb 27, 2025 06:20 PM IST
Class 12 CBSE Chemistry Answer Key 2025: Exam Difficulty Level
Based on initial feedback, the CBSE Class 12 Chemistry exam 2025 was of moderate difficulty. The paper included a balanced mix of conceptual, numerical, and application-based questions. While most students found the organic chemistry section easier, some reported that numerical questions from physical chemistry were tricky and required in-depth understanding.
Feb 27, 2025 06:00 PM IST
Class 12 CBSE Chemistry 2025 Answer Key: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: Scurvy is caused due to deficiency of
Answer: Ascorbic Acid
Feb 27, 2025 05:40 PM IST
Class 12 CBSE Chemistry Unofficial Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: Nucleotides are joined together by
Answer: Phosphodiester Linkage
Feb 27, 2025 05:20 PM IST
CBSE Class 12 Chemistry Unofficial Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: The number of molecules that react with each other in an elementary reaction is a measure of the:
Answer: molecularity of the reaction
Feb 27, 2025 05:00 PM IST
CBSE 12th Chemistry Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: The conversion of phenol to salicylic acid can be accomplished by
Answer: Kolbe Reaction
Feb 27, 2025 04:40 PM IST
Class 12 CBSE Chemistry Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: What will be formed after the oxidation reaction of secondary alcohol with chromic anhydride (CrO3)?
Answer: Ketone
Feb 27, 2025 04:20 PM IST
Class 12 CBSE Chemistry Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: Which is the correct IUPAC name for:
Answer: 1-Chloro-4-Methylbenzene
Feb 27, 2025 04:00 PM IST
CBSE 12th Chemistry Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: The diamagnetic species is:
Answer: [Ni(CN)4]2-
Feb 27, 2025 03:45 PM IST
CBSE 12th Chemistry Answer Key 2025: Exam Analysis
The following table displays the CBSE Class 12th Chemistry exam analysis 2025.
Parameter
Exam Analysis 2025
Overall difficulty level of the paper
Moderate to Tough Difficulty Level of Section A
Moderate Difficulty Level of Section B
Tough Difficulty Level of Section C
Moderate Difficulty Level of Section D
Moderate Difficulty Level of Section E
Moderate to Tough Expected Good Score
55+ Lengthiest Question (If any)
Assertion-reasoning and case-based questions Time-Consuming Section (If any)
Physical Chemistry Feb 27, 2025 03:30 PM IST
Class 12 CBSE Chemistry Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: The complex ions [Co(NH3)5 (NO2)]2+ and [Co(NH3)5(ONO)]2+ are called
Answer: Linkage Isomers
Feb 27, 2025 03:15 PM IST
Class 12 CBSE Chemistry Answer Key 2025: Exam Difficulty Level
Based on initial feedback, the CBSE Class 12 Chemistry exam 2025 was of moderate difficulty. The paper included a balanced mix of conceptual, numerical, and application-based questions. While most students found the organic chemistry section easier, some reported that numerical questions from physical chemistry were tricky and required in-depth understanding.
Feb 27, 2025 03:00 PM IST
Class 12 CBSE Chemistry 2025 Answer Key: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: The element having [Ar]3d104s1 electronic configuration is
Answer: Cu
Feb 27, 2025 02:45 PM IST
CBSE Class 12 Chemistry Unofficial Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: The number of molecules that react with each other in an elementary reaction is a measure of the:
Answer: molecularity of the reaction
Feb 27, 2025 02:30 PM IST
CBSE 12th Chemistry Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: 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.
Feb 27, 2025 02:15 PM IST
Class 12 CBSE Chemistry Unofficial Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the CBSE Class 12 Chemistry Answer Key 2025.
Question: The charge required for the reduction of 1 mol of MnO4- to MnO2 is
Answer: 5 F
Feb 27, 2025 02:00 PM IST
Class 12 CBSE Chemistry Answer Key 2025: When will Computer Science exam take place?
The CBSE Class 12 Computer Science exam will be conducted on March 29, 2025 from 10.30 AM to 1.30 AM.
Feb 27, 2025 01:45 PM IST
Class 12 CBSE Chemistry Answer Key 2025: When will Biology exam take place?
The CBSE Class 12 Biology exam will be conducted on March 25, 2025 from 10.30 AM to 1.30 AM.
Feb 27, 2025 01:30 PM IST
Class 12 CBSE Chemistry Answer Key 2025: Exam Concludes
CBSE Class 12 CHemistry exam has ended. Soon the candidates will find the answer key of the set-wise questions here.
Feb 27, 2025 01:15 PM IST
Class 12 CBSE Chemistry Answer Key 2025: When will Accountancy exam take place?
The CBSE Class 12 Accountancy exam will be conducted on March 26, 2025 from 10.30 AM to 1.30 AM.
Feb 27, 2025 01:00 PM IST
Class 12 CBSE Chemistry Answer Key 2025: Last Date of Exam
CBSE Class 12 exam will be ended on April 4, 2025 with the Psychology exam. After that the result will be released tentatively in the first week of June.
Feb 27, 2025 12:45 PM IST
Class 12 CBSE Chemistry Answer Key 2025: When will Economics exam take place?
The CBSE Class 12 Economics exam will be conducted on March 19, 2025 from 10.30 AM to 1.30 AM.
Feb 27, 2025 12:30 PM IST
Class 12 CBSE Chemistry Exam Analysis 2025: When will Hindi exam take place?
The CBSE Class 12 Hindi exam will be conducted on March 15, 2025 from 10.30 AM to 1.30 AM.
Feb 27, 2025 12:15 PM IST
Class 12 CBSE Chemistry Exam Analysis 2025: When will English exam take place?
The CBSE Class 12 English exam will be conducted on March 11, 2025 from 10.30 AM to 1.30 AM.
Feb 27, 2025 12:00 PM IST
Class 12 CBSE Chemistry Exam Analysis 2025: When will Mathematics exam take place?
The CBSE Class 12 Mathematics exam will be conducted on March 8, 2025 from 10.30 AM to 1.30 AM.
Feb 27, 2025 11:45 AM IST
Class 12 CBSE Chemistry Exam Analysis 2025: Upcoming Events
On February 28, 2025 the following exams will be conducted:
Exam Name Exam Time Financial Market Management 10:30 am - 1:30 PM Beauty and Wellness 10:30 am - 1:30 PM Medical Diagnostics 10:30 am - 1:30 PM Feb 27, 2025 11:30 AM IST
Class 12 CBSE Chemistry Exam Analysis 2025: Expected Analysis
Considering the previous years' trends, the experts assume that the CBSE Class 12 Chemistry paper will be tentatively moderate level.
Feb 27, 2025 11:15 AM IST
Class 12 CBSE Chemistry Exam Analysis 2025: Previous Year's Exam Analysis
As per the paper analysis, the CBSE Class 12 Chemistry paper was moderate to difficult level. MCQ part was slightly tricky, however, section B was easy. However, the section D was moderate.
Feb 27, 2025 11:00 AM IST
Class 12 CBSE Chemistry Exam Analysis 2025: When will exam end?
As per the exam schedule, the CBSE Class 12 Chemistry exam will be ended in two hours, at 1.30 PM. Once the exam will be ended, the Chemistry exam analysis will be added here.
Feb 27, 2025 09:10 AM IST
CBSE Class 12 Chemistry Exam 2025 Today
The Chemistry exam of CBSE Class 12 is being conducted today, and the answer key will be updated here after 2:00 PM.