ISC Class 12 Chemistry Answer Key 2026 OUT - Solved Key by Subject Experts, Question Paper PDF, Exam Analysis

The ISC Class 12 Chemistry Answer Key 2026 has been updated on February 23, 2026, after 5 PM. The ISC Chemistry exam has been conducted from 2:00 pm to 5:00 pm. With the help of the unofficial ISC Class 12 Chemistry answer key 2026, you can easily check the correct answers to the questions and estimate your expected scores before the official results are announced. The Question paper was moderate but lengthy. The evaluation process for ISC Class 12 papers starts once the examinations conclude, and as per the ISC 12th Passing Marks Criteria , you need 35% marks to pass the exam. To know more about the ISC Class 12 Chemistry Answer Key 2026, scroll down.

ISC Class 12 Unofficial Chemistry Answer Key 2026

We have updated the unofficial ISC Chemistry answer key 2026 here. You can use this answer key to check all your correct responses and calculate your raw marks before the release of the official ISC Result 2026.

Section	Question	Details	Options / Answers
Section A	Question 1 A	Fill in the blanks by choosing the appropriate words
	(i)	A mixture of anhydrous ZnCl₂ and conc. HCl is called...	(i) Lucus, tertiary alcohol
	(ii)	Methyl Chloride on treatment with...	(ii) alc.KCN, alc. AGCN
	(iii)	The hydrolysis of ethyl acetate in acidic medium is a pseudo...	(iii) First , two
	(iv)	Dissociation of solute particles leads to a/an...	(iv) increase, decrease
	Question 1 B	Select and write correct alternative from the choices
	(i)	Which of the following is a tetrahedral complex as well as diamagnetic in nature?	(i) [Ni(CO)₄]
	(ii)	When H₂S gas is passed through the acidified K₂Cr₂O₇ solution, the colour of the solution changes to:	(ii) - a Green
	(iii)	Identify the end product [C] in the following sequence of chemical reaction:	(iii) C - Acetyle Chloride
	(iv)	Iodoform reaction combination question	(iv) B - Only Q and R
	(v)	Which of the following Nitrogen bases is absent in RNA?	(v) D - Thymine
	(vi)	Assertion: Phenols are more acidic than aliphatic alcohols Reason: Phenoxide ion is stabalised by resonance but alkoxide ion is not stabalised by resonance.	(vi) Both assertion and reason are true and reason is the correct explanation for Assertion (vii) C - Assertion true Reason is false
	(vii)	Assertion: The depression of freezing point 0.1 molal aqueous solution of MgCl₂ is less than 0.1 molal aqueous solution of NaCl. Reason: The number of particles furnished by 0.1 molal MgCl₂ is less tha 0.1 molal NaCl.
Section B	Question 2	A reaction is first order w.r.t [A] and second order w.r.t [B]. Effect on rate if: (i) concentration of only B is increased three times (ii) Concentration of both A and B is doubled	(i) 9 times (ii) 0.28125
	Question 3	0.68 g compound dissolved in 15.0 g benzene. Freezing point lowered by 1.44°C. Calculate molecular mass.	161.9 g mol⁻¹
	Question 4	Write the IUPAC names of the following	(i) Tetraamminechloronitroplatinum(IV) sulfate (ii) Potassium tetracyanonickelate(II)
	Question 6	Calculate ΔG° for the cell at 25°C	Ecell = 0.62 V
	Question 8	First order reaction 40% complete in 20 min. Time for 90% completion.	K = 0.02555 min⁻¹
	Question 9	Write chemical test to distinguish: (a) Acetaldehyde and Acetone (b) Acetic acid and benzaldehyde	A - Iodoform Test B - Sodium bicarbonate test

How to Use ISC Class 12 Solutions 2026 to Calculate Your Expected Score

You can estimate your expected exam score using the ISC Class 12 solutions by following these steps:

• Step 1: Download the ISC Class 12 answer key PDFs from the links provided above.
• Step 2: Carefully compare your responses with the official solutions.
• Step 3: Assign marks according to the question type. For instance, MCQ-type questions carry 1 mark each.
• Step 4: Give 0 marks for incorrect or unanswered questions, as there is no negative marking.
• Step 5: Add up all the marks to calculate your total expected ISC Class 12 score.

ISC Class 12 Passing Marks 2026

The ISC Class 12 passing criteria require students to secure a minimum of 40% marks in each subject. Additionally, an overall aggregate of 35% is necessary to successfully pass the examination. Students must ensure they meet the minimum requirement in both theory and practical components, wherever applicable. It is important to prepare consistently across all subjects to avoid falling short of the required marks. Scoring well above the minimum passing percentage can also improve overall academic performance and future opportunities.

ISC 12th Grading System

The ISC 12th class grading system ranges from A to E. A is the highest grade score and E is the lowest grade score. The minimum grade required to pass the examination is 'D'. The table below provides detailed information about the ISC 12th grading system.

Grade	Remarks
A	Very Good
B	Good
C	Satisfactory Result
D	Fair
E	Fail

The ISC Class 12 Chemistry Answer Key 2026 helps students estimate their scores and analyze the exam pattern and difficulty level. The ISC 12th Result 2026 is expected to be declared in April or May 2026.