ISC 2026 Chemistry Answer Key: The Council for the Indian School Certificate Examinations (CISCE) conducted the ISC (class 12th) 2026 Chemistry exam today, February 23, 2026. The exam was conducted from 2:00 PM to 5:00 PM, and students were advised to arrive at their examination centres at least one hour before the scheduled exam time. Class 12th students who appeared for the chemistry exam can analyse their overall performance through the ISC 2026 Chemistry Answer Key Unofficial and detailed question paper analysis.Â
The ISC Class 12 Chemistry exam for 2026 is carried for a total of 100 marks. However, the theory paper of 70 marks will be conducted today for 3 hours. The ISC 2026 Chemistry Question Paper is divided into four distinct sections. All questions are compulsory; however, students are given Internal choices in one question from each of Sections B, C, and D to help them manage the difficulty.
ISC 2026 Chemistry Answer Key Unofficial
The ISC (12TH) Chemistry Theory Paper (Paper I) carries 70 marks. The question paper was divided into 4 sections. Section A includes MCQs and objective-type questions of 14 marks, Section B comprises 10 short-answer questions of 2 marks each (20 marks total), while Section C contains 7 questions of 3 marks each (21 marks total). Finally, Section D includes 3 long-answer questions of 15 marks total. Students can go through the unofficial answer key to check their performance.
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Questions |
Answers |
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SECTION - A Question 1 A Fill in the blanks by choosing the appripriate words: (i) A mixture of anhydrous ZnCl2 and con. HCL is called... (ii) Methyl Chloride on treatment with... (iii)The hydrolysis of ethyl acetate in acidic medium is a pseudo... (iv) Dissociation of solute particles leads to a/an... |
(i) Lucus , tertiary alcohol (ii) alc.KCN , alc. AGCN (iii) First, two (iv) increase, decreas |
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Question: 1 B Select and write correct alternative from the choices (i) Which of the following is a tetrahedral cimplex as well as diamagnetic in nature? (ii) When H2S gas is passed through the acidified K2Cr2O7 solution, the colour of the solution changes to: (iii) Identify the end product [C] in the following sequence of chemical reaction: (iv) Rohit is studying the idoform reaction by using the following compounds. Which of the following combinations will give an idoform test when the compounds are heated separetly with iodine and aqueous NaOH? (v) Which of the following Nitrogen bases is absent in RNA? (vi) Assertion: Phenols are more acidic than aliphatic alcohols Reason: Phenoxide ion is stabalised by resonance but alkoxide ion is not stabalised by resonance. (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. |
(i) [Ni(CO)4] (ii) - a Green (iii) C - Acetyle Chloride (iv) B - Only Q and R (v) D - Thymine (vi) Both assertion and reason are true and reason is the correct explanation for Assertion (vii) C- Assertion true Reason is false |
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Question: 1 C Read the information given below and answer the questions that follow: (ii) Calculate the molar conductance of infinity dilution... |
(ii) 279.8 |
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Section B Question 2: A reaction si fo first order with respect to reactant [A] and second order with regard to reactant [B]. What is the effect on rate of reaction if: (i) concentration of only B is increased by three times (ii) Concentration of both A and B is doubled |
(i) 9 times (ii) 0.28125Â |
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Question 3: 0.68 g of a compund is dissolved in a 15.0g of benzene and the freezing point of solution is lowered by 1.44°C. Calculate the experimetal molecular mass of the compund. |
161.9 g mol-1 |
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Question 4:Â Write the UPAC names of the following |
(i) Tetraamminechloronitroplatinum(IV) sulfate (ii) Potassium tetracyanonickelate(II) |
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Question 6: Calculate the value of ΔG° for the following cell at 25°C |
Ecell = 0.62 V |
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Question 8:Â A first order reaction of 40% complete in 20 minutes. Calculatethe time required for 90% completion of the same reaction. |
K = 0.02555 min-1 |
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Question 9:Â (i) Write chemical test to distinguish between the following pairs of compounds: (a) Acetaldehyde and Acetone (b) Acetic acid and benzaldehyde |
9(i) A - Idoform Test B - Sodium bicarbonate test |
ISC 2026 Chemistry Detailed Question Paper Analysis
Here’s the detailed analysis of the ISC 2026 Chemistry Exam based on the students’ feedback and subject experts’ reviews:
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Particulars |
ISC Chemistry Exam Analysis 2026 |
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Overall Difficulty Level |
Moderate |
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Section A Difficulty Level |
Easy to Moderate |
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Section B Difficulty Level |
Moderate |
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Section C Difficulty Level |
Moderate |
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Was The Paper Lengthy? |
Yes, according to stiudent's reaction, the paper was lengthy. |
While the ISC 2026 Chemistry Unofficial Answer Key and Exam analysis provide a deep dive, students must note that this is only for performance evaluation and can be used for reference purposes only.
Students who appeared for the English Paper 2 Exam can check the ISC 12th English Paper 2 Answer Key 2026 LIVE Updates: Unofficial Key, Detailed Exam Analysis
Live Updates
Yes, ISC follows step-wise marking. Even if the final answer is wrong, students receive marks for correct formulas and intermediate steps.
According to the student;s reaction and subject experts, the paper was moderately difficult. It was doable and yes, a bit lengthy. Numerical questions and reaction-related questions were tricky.
According to the student's initial response, there is a mixed reaction. Some students found the paper moderate but lengthy; others found the paper a bit on the tougher side. A detailed exam analysis will be updated soon.
The ISC 2026 Chemistry Exam concludes at 5:00 PM after 3 hours. The exam was scheduled from 2:00 PM to 5:00 PM. Students will be exiting their class anytime soon.
The ISC (Class 12th) 2026 Chemistry Exam will be over in 30 minutes. Students will be completing their answers now.
Students must secure at least 35% marks to be declared a pass in the subject.
The exam is out of 100 marks, and the ISC 2026 Chemistry Question Paper is split into a 70-mark theory paper (Paper I) and the remaining 30-mark practical/project assessment (Paper II) is an internal exam.
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Particulars |
Details |
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Overall difficulty level |
Moderate |
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Section A |
Easy To Moderate (Direct Questions) |
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Section B and C |
Moderate (Mostly numerical questions, chemical reactions, name tests) |
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Section D |
Moderate (Time-Consuming) |
The ISC (12th) Chemistry Exam 2026 has finally commenced as per the schedule at 2:00 PM. Students have started writing the answers. The exam will conclude at 5:00 PM.
Students have started entering the examination hall after the admit card verification. As per the rule, authorities will provide students with the ISC Chemistry Question Paper for reading at 10:45 AM. After 15 minutes, i.e., at 12:00 PM, they will start writing the answers.
Here is the exam pattern for the ISC 2026 Chemistry exam condensed into two bullet points:
- Theory Paper (70 Marks): A 3-hour exam consisting of Section A (14 objective marks), Section B (20 marks), Section C (21 marks), and Section D (15 marks).
- Practical Assessment (30 Marks): A separate evaluation divided into Practical Work (15 marks), Project Work(10 marks), and the Practical File (5 marks).
Students are advised to reach their respective examination centres early or at least 1 hour before the exam timing to sit for their ISC 2026 Chemistry Exam.
The Council for the Indian School Certificate Examinations (CISCE) will conduct the class 12th (ISC) Chemistry exam 2026 today, February 23, 2026, as scheduled, from 2:00 PM to 5:00 PM.