ISC Class 12 Chemistry Answer Key 2025 and Question Papers, Download PDF All SETs

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The ISC Class 12 Chemistry 2025 exam was conducted today, February 24, 2025. The exam lasted for 3 hours, was conducted from 2 PM to 5 PM, with an additional 15 minutes for reading the question paper.

The total marks allotted for the subject are 80 marks and 20 are for internal assessment. The question paper consisted of four sections – Question 1, Question 2, Question 3 and Question 4.

Here we are providing a detailed analysis of student responses, expert opinions and the difficulty level of the paper including expected good scores, time-consuming section and longest question.

We have shared the ISC Class 12 Chemistry question paper 2025 PDF and answer key to help students check their answers and evaluate their performance.

👉 ISC Class 12 Chemistry Question Paper 2025, Download FREE PDF

ISC Class 12 Chemistry Exam Analysis 2025

Here is the complete Class 12 ISC Chemistry Exam Analysis 2025 in the table below:

Parameter	Exam Analysis 2025
Overall difficulty level of the paper	Moderate
Difficulty Level of Section A	Easy
Difficulty Level of Section B	Easy to Moderate
Difficulty Level of Section C	Moderate
Difficulty Level of Section D	Moderate
Expected Good Score	60+
Lengthiest Question (If any)	The paper wasn't lengthy.
Time-Consuming Section (If any)	Compared to other sections, Section D was a little time-consuming.

ISC Class 12 Chemistry Exam Analysis 2025

Students' Feedback:

The exam had a mix of easy and moderate sections.
Reading comprehension and grammar were simple.
The literature section was tricky for some.
Essay and letter writing topics were unexpected but not very hard.
No out-of-syllabus questions; the paper was manageable.

Teachers' Perspective:

The exam was fair, well-organized, and balanced.
Covered all important syllabus topics.
Reading and writing sections were easy, but literature required deeper analysis.
Encouraged critical thinking and application of knowledge.
No surprise or out-of-syllabus questions, making it comfortable for all students.

ISC Class 12 Chemistry Answer Key 2025

The ISC Class 12 Chemistry 2025 Answer Key will be available .

Section A Question 1 (Part - A)

Question Number	Answer Key
(i) _____ is an example of a primary cell but _____ is an example of a secondary cell.	Dry Cell, Nickel-cadmium cell
(ii) The complex compound [Ni(CO) ₄] is ______ in shape and nickel is in ____ oxidation state in this complex compound.	Tetrahedral, Zero
(iii) When acetaldehyde is treated with hydrazine and KOH in a high boiling solvent glycol, _____ is formed and the reaction is known as _____ reduction.	Ethane, Wolff-Kishner
(iv) The transition metal ions having _____ d-orbitals are colourless and _____ in nature.	Completely filled, Diamagnetic

Section A Question 1 (Part - B)

Question Number	Answer Key
(i) Which one of the following can produce the foul smelling compound methyl isocyanide in presence of alcoholic KOH? (a) Chloroform and aniline (b) Chloroform and methanol (c) Chloroform and dimethyl amine (d) Chloroform and methyl amine	(d) Chloroform and methyl amine
(ii) The osmotic pressure of a solution: (P) Increases with an increase in number of moles of solute (Q) Decreases with an increase in number of moles of solute (R) Increases at a higher temperature (S) Is dependent on the nature of solute Which one of the following is correct? (a) Only P and Q are correct (b) Only P and R are correct (c) Only P and S are correct (d) Only Q and S are correct	(b) Only P and R are correct
(iii) Which one of the following alcohols is the strongest acids? (a) Phenol (b) Methanol (c) Ethanol (d) t-butyl alcohol	(a) Phenol
(iv) Which one of the following does NOT form a silver mirror on heating with Tollen's reagent? (a) Glucose (b) Fructose (c) Sucrose (d) Lactose	(c) Sucrose
(v) The coordination number and the oxidation state of the central metal 'D' in the complex [D(en) ₂(H ₂O) ₂]Cl ₃are: (a) 6 and 2 respectively (b) 4 and 2 respectively (c) 3 and 6 respectively (d) 6 and 3 respectively	(d) 6 and 3 respectively
(vi) Given below are two statements marked Assertion and Reason. Read the two statements carefully and select the correct option. Assertion : The process of halogenation of benzene takes place in the presence of anhydrous FeCl ₃ Reason : Anhydrous FeCl ₃prepares nucleophiles to attack the benzene ring. (a) Both Assertion and Reason are true and Reason is the correct explanation for Assertion. (b) Both Assertion and Reason are true but Reason is not the correct explanation for Assertion. (c) Assertion is true and Reason is false. (d) Both Assertion and Reason are false.	(c) Assertion is true and Reason is false.
(vii) Given below are two statements marked Assertion and Reason. Read the two statements carefully and select the correct option. Assertion : The Zr-Hf pair of elements has the same value of atomic radii though Zr and Hf are placed in different periods in the periodic table. Reason : The lanthanoid contraction prevents the expected increase in atomic radii of Hf. (a) Both Assertion and Reason are true and Reason is the correct explanation for Assertion. (b) Both Assertion and Reason are true but Reason is not the correct explanation for Assertion. (c) Assertion is true and Reason is false. (d) Both Assertion and Reason are false.	(a) Both Assertion and Reason are true and Reason is the correct explanation for Assertion.

Section A Question 1 (Part - C)

Question Number	Answer Key
To Be Updated	To Be Updated

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