ISC Class 12 Chemistry Answer Key 2025 Out, Download Question Paper with Solutions for All sets

The ISC Class 12 Chemistry Answer Key 2025 along the complete analysis is shared on this page allowing students to cross check their responses whether they are correct or wrong. Download Class 12 ISC Chemistry Answer key 2025 with question paper pdf for all sets from this page.

Table of Contents

The Council for the Indian School Certificate Examinations (CISCE) successfully conducted the ISC Class 12th Chemistry Exam 2025 today, February 24, 2025 [Monday]. After taking the exams, students are eager to find the ISC Class 12 Chemistry Answer Key 2025 on the internet. We at adda247 present you with the most recent ISC Chemistry Answer Key 2025 for all sets on this website. Using it, students may cross-check their answers to see if they are valid or incorrect, as well as predict their possible marks in the chemistry exam.

ISC Class 12 Chemistry Answer Key 2025

The Council for the Indian School Certificate Examinations held the Class 12 ISC Chemistry 2025 exam today, February 24, from 2 PM to 5 PM. As the examination has ended, this page now contains the comprehensive analysis of the Class 12th ISC Chemistry Paper 2025, as well as the answer key.

ISC Class 12th Chemistry Answer Key 2025 allows students to compare their answers and estimate their prospective marks. Once the answer key is available, students can compare their answers to the correct ones and assess their performance on the exam. This technique assists students in identifying areas for improvement and places where they excelled.

Class 12 ISC Chemistry Answer Key 2025

Using the Class 12 ISC Chemistry Answer Key 2025, Candidates can access unofficial answers to objective questions asked in Section A Question 1, Parts A, B, and C. The answers to all questions until Question 21, as well as Sections B, C, and D, will remain subjective. Candidates can assess their performance by reviewing the answer key and calculating their exam scores. The ISC Class 12 Chemistry Answer keys are provided for all sets hereunder.

Section A Question 1 (Part – A)

(i) _____ is an example of a primary cell but _____ is an example of a secondary cell.
Answer: Dry Cell, Nickelcadmium cell
(ii) The complex compound [Ni(CO) 4] is ______ in shape and nickel is in ____ oxidation state in this complex compound. Answer: 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.
Answer: Ethane, WolffKishner
(iv) The transition metal ions having _____ d-orbitals are colourless and _____ in nature.
Answer: Completely filled, Diamagnetic

Section A Question 1 (Part – B)

(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
Answer: (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

Answer: (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
Answer: (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
Answer:(c) Sucrose
(v) The coordination number and the oxidation state of the central metal ‘D’ in the complex [D(en) 2 (H 2 O) 2 ]Cl 3 are:
(a) 6 and 2 respectively
(b) 4 and 2 respectively
(c) 3 and 6 respectively
(d) 6 and 3 respectively
Answer: (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 3 prepares 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.
Answer: (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.
Answer: (a) Both Assertion and Reason are true and Reason is the correct explanation for Assertion.

ISC Class 12 Chemistry Paper 2025 PDF Download

The ISC Class 12 Chemistry Exam was successfully performed on February 24, 2025. The exams last three hours and begin at 2 p.m. Students are given 15 minutes extra time to peruse the question paper. Thus, the question papers will be distributed at 1:45 p.m. Click the direct link to download the Class 12th ISC Chemistry Paper 2025 PDF.

Class 12th ISC Chemistry Paper 2025 Analysis

The ISC Class 12 Chemistry Paper 2025 consisted of simple and moderate difficulty levels. Many students found the reading comprehension and grammar sections uncomplicated, but the literary element was more difficult for some. Essay and letter writing subjects were unexpected for some, but not difficult. Overall, the paper was of average level, with some students finding it easier and others finding it more challenging. There were no questions outside of the syllabus, and most students thought the paper was manageable.

However, the teachers described the ISC Class 12 Chemistry exam 2025 as fair, well-organized, and balanced. Teachers regarded the ISC Class 12 Chemistry exam 2025 to be fair, well-organised, and balanced. Overall, teachers believed that students who had studied well would do well. They also appreciated the lack of unexpected or out-of-syllabus questions.