Class 12 CBSE Chemistry Answer Key 2025: Soon after the Class 12 CBSE Chemistry 2025 exam ends today, February 27, 2025 at 1:30 pm, the Class 12 CBSE Chemistry Answer Key 2025 set-wise will be updated here. It should be noted that the answers to all objective-type questions will be updated here and for subjective-type questions, students should refer to teachers' own books for answers, as they are based on students' opinions. The question paper is divided into five sections of different marks, and all questions are compulsory with internal choice questions. However, in section A, objective-type questions will not have any optional choice questions, hence, all answers must be attempted.
To pass the Class 12 CBSE Chemistry exam, students must score at least 33% marks overall and separately in practical and theory papers. After the answer key for CBSE Class 12 Chemistry 2025 is released, students can use it to analyze and calculate their expected marks. We will also provide the CBSE Class 12 Chemistry answer key after the exam.
CBSE Class 12 Chemistry Answer Key Dates 2025
The CBSE board will conduct the Class 12 CBSE Chemistry exam for 3 hours. Students can check the table below to stay updated with the CBSE exam schedule for the Chemistry answer key.
|
Events |
Dates |
|
CBSE 12th Chemistry exam date |
February 27, 2025 |
|
CBSE 12th Chemistry exam time |
10:30 am to 1:30 pm |
|
Unofficial CBSE 12th Chemistry answer key |
February 27, 2025 |
CBSE Class 12 Chemistry Answer Key Link 2025
CBSE Class 12th Chemistry Answer Key has not been officially published by the board However, right after the exam, well-known coaching institutes will publish the CBSE Class 12th answer key for students. The link for the unofficial CBSE Class 12 Chemistry answer key is given blow
|
Set |
Answer key link |
|
CBSE Class 12 Chemistry Answer Key Set 1 |
|
|
CBSE Class 12 Chemistry Answer Key Set 2 |
|
|
CBSE Class 12 Chemistry Answer Key Set 3 |
|
|
CBSE Class 12 Chemistry Answer Key Set 4 |
CBSE Class 12 Chemistry Exam Pattern 2025
The Central Board of Secondary Education (CBSE) will conduct the CBSE 12th Chemistry theory exam for a total of 70 marks. Students need to know about the exam pattern as it helps them understand where they lost marks. They can check the CBSE Class 12 answer key for Chemistry and use it to match their answers and evaluate their expected performance.
CBSE Class 12 Exam Pattern for Chemistry 2025
|
Type of Questions |
No. of Questions |
Total Marks |
|
1 mark questions |
16 |
16 |
|
2 mark questions |
5 |
10 |
|
3 mark questions |
7 |
21 |
|
4 mark questions |
2 |
8 |
|
5 mark questions |
3 |
15 |
|
Total |
33 |
70 |
CBSE Class 12 Chemistry Answer Key 2025 Important Points
Students who are calculating their expected marks using the CBSE Class 12 Chemistry answer key must keep the following points in mind, such as
- After the unofficial CBSE Class 12 answer key is released, students will have to follow the marking scheme of the respective paper to calculate the marks.
- There will be no negative marking for wrong answers.
CBSE Class 12th Chemistry Answer Key 2025
Get the CBSE Class 12th Chemistry answer key 2025 from here which is prepared by subject experts. Students can find the answers to all the questions asked in the CBSE Class 12th Chemistry question paper 2025 below.
|
Q. No. |
Question |
Options |
Correct Answer |
|
1 |
The charge required for the reduction of 1 mol of MnO4− to MnO2 is |
(A) 1 F (B) 3 F (C) 5 F (D) 6 F |
(B) 3 F |
|
2 |
Which among the following is a false statement? |
(A) Rate of zero-order reaction is independent of initial concentration (B) Half-life of zero-order reaction is inversely proportional to rate constant (C) Molecularity of a reaction may be zero (D) For 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 |
(A) Activation energy of reaction (B) Stoichiometry of reaction (C) Molecularity of reaction (D) Order of reaction |
(C) Molecularity of the reaction |
|
4 |
The element having [Ar] 3d10 4s2 electronic configuration is |
(A) Cu (B) Zn (C) Cr (D) Mn |
(B) Zn |
|
5 |
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 |
(B) Linkage isomers |
|
6 |
The diamagnetic species is |
(A) [Ni(CN)4]2- (B) [NiCl4]2− (C) [Fe(CN)6]3− (D) [CoF6]3− |
(A) [Ni(CN)4]2- |
|
7 |
The correct IUPAC name for the compound |
(A) Methylchlorobenzene (B) Toluene (C) 1-Chloro-4-Methylbenzene (D) 1-Methyl-4-Chlorobenzene |
(C) 1-Chloro-4-Methylbenzene |
|
8 |
Product formed after oxidation of secondary alcohol with chromic anhydride (CrO3)? |
(A) Aldehyde (B) Ketone (C) Carboxylic acid (D) Ester |
(B) Ketone |
|
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 |
(C) Kolbe reaction |
|
10 |
Examples of denaturation of protein |
(A) Coagulation of egg white (B) Curdling of milk (C) Clotting of blood (D) Both (A) and (B) |
(D) Both (A) and (B) |
|
11 |
Nucleotides are joined together by |
(A) Glycosidic linkage (B) Peptide linkage (C) Hydrogen bonding (D) Phosphodiester linkage |
(D) Phosphodiester linkage |
|
12 |
Scurvy is caused due to deficiency of |
(A) Vitamin B1 (B) Vitamin B2 (C) Ascorbic acid (D) Glutamic acid |
(C) Ascorbic acid |
|
13 |
Assertion: In a first-order reaction, if the concentration of the reactant is doubled, its half-life is also doubled. Reason: The half-life of a reaction does not depend upon the initial concentration of the reactant in a first-order reaction. |
(A) Both (A) and (R) are true, and (R) is the correct explanation of (A) (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A) (C) (A) is true, but (R) is false (D) (A) is false, but (R) is true |
(D) (A) is false, but (R) is true |
|
14 |
Assertion: Cu cannot liberate H2 in reaction with dilute mineral acids. Reason: Cu has a positive electrode potential. |
(A) Both (A) and (R) are true, and (R) is the correct explanation of (A) (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A) (C) (A) is true, but (R) is false (D) (A) is false, but (R) is true |
(A) Both (A) and (R) are true, and (R) is the correct explanation of (A) |
|
15 |
Assertion: Aromatic primary amines cannot be prepared by Gabriel Phthalimide synthesis. Reason: Aryl halides do not undergo nucleophilic substitution reaction with the anion formed by phthalimide. |
(A) Both (A) and (R) are true, and (R) is the correct explanation of (A) (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A) (C) (A) is true, but (R) is false (D) (A) is false, but (R) is true |
(A) Both (A) and (R) are true, and (R) is the correct explanation of (A) |
|
16 |
Assertion: Vitamin D cannot be stored in our body. Reason: Vitamin D is a fat-soluble vitamin and is not excreted from the body in urine. |
(A) Both (A) and (R) are true, and (R) is the correct explanation of (A) (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A) (C) (A) is true, but (R) is false (D) (A) is false, but (R) is true |
(D) (A) is false, but (R) is true |
Section - A Multiple Choice Questions (QP Code- 56/5/3)
|
QP Number |
Questions |
Options |
Correct Answers |
|
1 |
CH₃CH₂CHO and CH₃CH₂COOH can be distinguished by |
Sodium bicarbonate test, Tollens' Test, Fehling's Test, Iodoform Test |
Sodium bicarbonate test |
|
2 |
Potassium chromate solution changes to orange due to |
H₂SO₄ Solution, HCL Solution, NaOH Solution, NH₃ Solution |
HCL Solution |
|
3 |
The role of a catalyst is to change |
Enthalpy, Activation energy, Temperature, Reaction rate |
Activation energy of reaction |
|
4 |
Which molecule is chiral in nature? |
1-chloropropane, 2-chloropropane, 1-chlorobutane, 2-chlorobutane |
2-chlorobutane |
|
5 |
CH₃C₂OH can be converted to CH₃CHO by |
PCC, KMnO₄, H₂SO₄, H₂O₂ |
Treatment with PCC |
|
6 |
IUPAC name for CH₃-CH₂-N(CH₃)-CH₂-CH₂-CH₃ |
N-ethyl-N-methylpropan-1-amine, N-methyl-N-ethylpentan-1-amine, N,N-Dimethylethylamine, N-methyl-N-ethylpropylamine |
N-ethyl-N-methylpropan-1-amine |
|
7 |
Order of reaction indicated by graph |
Zero order, First order, Second order, Third order |
Zero order |
|
8 |
Ethyl bromide with alcoholic silver nitrite gives |
Nitroethane, Ethylamine, Ethanol, Ethyl nitrate |
Nitroethane |
|
9 |
Aqueous solution with highest freezing point |
1.0 M NaCl, 1.0 MKCl, 1.0 MgCl₂, 1.0 CaCl₂ |
1.0 MKCl |
|
10 |
Aldehyde undergoing Cannizzaro reaction |
CH₃CHO, C₆H₅CHO, (CH₃)₃CCHO, CH₃CH₂CHO |
(CH₃)₃CCHO |
|
11 |
Coloured ions in aqueous solution |
Cu²⁺ and Zn²⁺, Fe³⁺ and Al³⁺, Co²⁺ and Fe²⁺, Cr³⁺ and Mg²⁺ |
Co²⁺ and Fe²⁺ |
|
12 |
Match the following |
i. Lead Storage cell - Inverter, ii. Mercury Cell - Wrist watch, iii. Dry cell - Wall clock, iv. Fuel cell - Apollo Space Program |
i-d, ii-c, iii-a, iv-b |
Section - A Multiple Choice Questions (QP Code- 56/6/1)
|
QP Number |
Questions |
Options |
Correct Answers |
|
1 |
Williamson Synthesis is |
SN1 reaction, SN2 reaction, Elimination, Addition |
SN2 reaction |
|
2 |
Compound hydrolysed by aqueous KOH easily |
Benzyl chloride, Vinyl chloride, Allyl chloride, Ethyl chloride |
Benzyl chloride |
|
3 |
According to Werner's theory |
Primary valences are ionisable, Secondary valences are non-ionisable, Both A & B, None |
Primary valences are ionisable |
|
4 |
Complex ion not optically active |
cis-[Co(en)₂Cl₂]⁺, trans-[Co(en)₂Cl₂]⁺, [Co(NH₃)₄Cl₂]⁺, [Co(en)₃]³⁺ |
trans-[Co(en)₂Cl₂]⁺ |
|
5 |
Softest metal |
Zn, Cu, Na, Fe |
Zn |
|
6 |
Reagent in Hinsberg’s method |
KOH, HNO₃, Benzene Sulphonyl Chloride, NaOH |
Benzene Sulphonyl Chloride |
|
7 |
Amine giving alcohol with HNO₂ |
CH₃NH₂, C₂H₅NH₂, (CH₃)₂NH, (C₂H₅)₂NH |
C₂H₅NH₂ |
|
8 |
Freezing point of one molal KCl solution |
-3.72°C, -1.86°C, -0.93°C, -5.12°C |
-3.72°C |
|
9 |
Acetone in ethanol shows |
Positive deviation, Negative deviation, No deviation, Ideal behavior |
Positive deviation |
|
10 |
Cell converting fuel into electrical energy |
Galvanic Cell, Fuel Cell, Electrolytic Cell, Dry Cell |
Fuel Cell |
|
11 |
Rate and rate constant same for |
Zero order, First order, Second order, Third order |
Zero order |
|
12 |
Pyranose ring formation |
C₁ and C₆, C₂ and C₅, C₁ and C₅, C₂ and C₆ |
C₁ and C₅ |
|
13 |
Actinoids oxidation states |
True, False, Both A and R are true, but R is not the correct explanation |
Both A and R are true but R is not the correct explanation |
|
14 |
Hydrolysis of ester kinetics |
True, False, Both A and R are true, but R is not the correct explanation |
Both A and R are true but R is not the correct explanation |
|
15 |
Boiling point of (CH₃)₃N vs CH₃CH₂CH₂NH₂ |
A is true but R is false, A is false but R is true, Both A and R are true, None |
A is true but R is false |
|
16 |
Phenol acidity compared to ethanol |
A is true but R is false, A is false but R is true, Both A and R are true, None |
A is false but R is true |
Steps to Calculate Marks Using CBSE Class 12 Chemistry Answer Key 2025
Step 1: Click on the direct link (will be shared soon) to download 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 answer key.
Step 3: Award yourself marks for each correct answer and if necessary deduct marks for wrong answers as per the marking rules.
Step 4: After reviewing all the answers add up all the marks to estimate your total score
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