ISC 12th Chemistry (Paper 1) Question Paper 2025; Download PDF Here

Table of Contents

The Council For the Indian School Certificate Examinations (CISCE) successfully conducted the ISC 12th Chemistry (Paper 1) Exam 2025 today i.e., February 24, 2025 [Monday]. The exam was held in the afternoon shift, i.e., from 02:00 pm onwards. As the final revision continues, students are focusing on their class 10th English sample papers, along with the previous year’s papers for their end-time preparation. These papers will provide an idea of the paper pattern and the type of questions asked. As the exam is successfully held, we have also updated a direct link to download the set-wise ISC 12th Chemistry (Paper 1) Question Paper 2025 in the article below.

ISC 12th Chemistry (Paper 1) Question Paper 2025

The exam was successfully held in offline pen and paper mode at various examination centers allocated by the board. Students were given a total of 3 hours to finish the exam, with an extra 15 minutes for reading the question paper and completing other formalities. The ISC 12th Chemistry (Paper 1) Question Paper 2025 consisted of 21 questions that were divided into 4 different sections.

The ISC 12th Chemistry (Paper 1) Theory Exam 2025 is held for a total of 70 marks while 30 marks are given based on the practical exam. The paper includes different types of questions based on chapters like Solutions, Electrochemistry, d -and f -Block Elements, Coordination Compounds, and many more.

ISC 12th Chemistry (Paper 1) Question Paper 2025
Conducting Body	Council For the Indian School Certificate Examinations (CISCE)
Name of Examination	ISC 12th Chemistry (Paper 1) Exam 2025
Category	Question paper
Status	Released
ISC 12th Chemistry (Paper 1) Exam Date 2025	February 24, 2025
Exam Duration	3 hours
Mode of Examination	Offline pen and paper mode
Total Marks	100 marks
Negative Marking	There will be no negative marking

ISC 12th Chemistry Questions – By Experts

Question 1:

A- Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:

[four, three, remains same, propane, ns^1-2, increases, six, propan-2-ol, (n-1)d^1-10, two, decreases, Clemmensen’s, Wolff-Kishner]

The molar conductance of a solution _________ on dilution but the specific conductance of a solution _________ on dilution.
In the complex ion [CoCl(en)2ONO]+, the coordination number and the oxidation number of the central metal ion are ______ and ________.
Propanone on reaction with zinc amalgam in the presence of concentrated HCl gives ______ and the reaction is called _______ reduction.
The variation and magnitude of oxidation state in coordination complexes is due to the participation of inner ________ electrons in addition to outer __________ electrons.

B- Select and write the correct alternative from the choices given below.

The correct order of the increasing basic nature of Ammonia, Methylamine and Aniline is:

(a) Methylamine < Aniline < Ammonia

(b) Aniline < Methylamine < Ammonia

(d) Aniline < Ammonia < Methylamine

Colligative properties of a solution are:

(P) Independent of the nature of solute

(Q) Proportional to molecular mass of solute

(R) Proportional to concentration of solute

(S) Independent of the amount of solvent

(a) Only P and Q are correct

(b) Only P and R are correct

(d) Only Q and S are correct

According to Markownikoff’s rule, “The negative part of the halogen acid attaches itself with that C atom of an unsymmetrical alkene which has the least number of H-atom.” Anti-Markownikoff’s addition of HBr is NOT observed in: (Analysis)

a) Propene

b) But-2-ene

c) But-1-ene

d) Pent-2-ene

Most of the naturally occurring α-amino acids are optically active and have L-configuration. Which of the following amino acids is NOT asymmetric?

a) Valine

b) Alanine

c) Glycine

d) Leucine

Given below are two statements marked Assertion and Reason. Read the two statements carefully and select the correct option.

Assertion: Tertiary butyl bromide undergoes Wurtz reaction to give 2,2,3,3 tetramethyl butane.

Reason: In the Wurtz reaction, when the same alkyl halides react with sodium in dry ether to give hydrocarbon; the hydrocarbon formed contains double the number of carbon atoms present in the alkyl halide.

a) Both Assertion and Reason are true and Reason is the correct explanation of assertion.

b) Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.

c) Assertion is true but Reason is false.

d) Both Assertion and Reason are false.

ISC Class 12th Chemistry Question Paper 2025 PDF Download

After successful completion of the ISC 12th Chemistry (Paper 1) Exam 2025 today i.e., February 22, 2025 have shared the set-wise Chemistry Question Paper PDF here. The direct links to access the ISC 12th Chemistry (Paper 1) Question Paper 2025 set 1, 2, and 3 PDF have been shared here. These question papers are useful for students both after and before the exam. Before exams, the previous year’s papers help students understand the paper pattern, important topics, and time management. After the exams, these set-wise ISC 12th Chemistry (Paper 1) Question Paper 2025 along with the answer keys help students check their answers and make an estimated idea of their performance.