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TN HSC 2026 Chemistry Answer Key Unofficial (OUT) LIVE Updates: Answer Key; Analysis

Students of TN Board can access the TN HSC 2026 Chemistry Answer Key Unofficial available here for reference.

Mohith Kumar

Updated on - Mar 9, 2026 | 2:38:00 PM

Get TN HSC 2026 Chemistry Answer Key Unofficial LIVE Updates Here.

TN HSC 2026 Chemistry Answer Key Unofficial: The Directorate of General Education, Tamil Nadu (TNDGE), is conducting the Class 12 Chemistry Examination 2026 today, March 9, 2026. The examination is being held from 10 AM to 1:15 AM. The Chemistry exam follows a structured marking scheme. The total assessment is out of 100 marks, split between theory (70 marks) and practicals/internals (30 marks). Students appearing for the exam can check the TN HSC 2026 Chemistry Answer Key Unofficial available here for reference, along with the detailed exam analysis.

TN HSC 2026 Chemistry Answer Key Unofficial

The TN Class 12 Chemistry Unofficial Answer Key is available in the table below. Students can access the answer key and and analyse thier performances.

TN HSC 2026 Chemistry Questions and Answers

1. The stability of +1 oxidation state increases in the sequence
(a) In < Tl < Ga < Al
(b) Al < Ga < In < TI
(c) Ga < In < Al < TI
(d) Tl < In < Ga < Al

Answer: (b) Al < Ga < In < TI

2. XeF, on complete hydrolysis produces:
(a) XeO ₃
(b) XeOF ₄
(c) XeO ₂
(d) XeO ₂F _{2
Answer: (a) XeO 3}

4. Electrochemical process is used in the extraction of which of the following element?
(a) Sodium
(b) Iron
(c) Silver
(d) Lead

Answer: (a) Sodium

6. Which of the following statements is incorrect?
(a) Co³+ and Fe2+ have same number of unpaired electrons.
(b) Of all the known elements, Silver has the highest electrical conductivity at room temperature.
(c) To form a substitute alloy, the difference between the atomic radii of solvent and solute should be less than 15%.
(d) If the standard electrode potential (E°) of a metal is large and negative, the metal is a powerful oxidising agent.

Answer: (d) If the standard electrode potential (E°) of a metal is large and negative, the metal is a powerful oxidising agent.

7. Drugs that bind to the receptor site and inhibit its natural function are called
(a) enzymes
(b) antagonists
(c) molecular targets
(d) agonists

Answer: (b) antagonists

8. On which of the following properties does the coagulating power of an ion depend?
(a) The magnitude of the charge on the ion alone.
(b) Both magnitude and sign of the charge on the ion.
(c) The sign of charge on the ion alone.
(d) Size of the ion alone.

Answer: (b) Both magnitude and sign of the charge on the ion.

9. α-D(+) Glucose and B-D(+) Glucose are:
(a) Enantiomers
(b) Epimers
(c) Conformational isomers
(d) Anomers

Answer: (d) Anomers

10.

11. The molar conductivity of a 0.5 mol dm ^-3solution of AgNO ₃with specific conductance 5.76×10 ^-3Scm ^-1at 298 K is:
(a) 0.086 Scm² mol ^-1
(b) 2.88 Scm² mol ^-1
(c) 28.8 Scm² mol ^-1
(d) 11.52 Scm² mol ^-1

^{Answer: (d) 11.52 Scm² mol -1}

12. Assertion: Due to Frenkel defect, density of the crystalline solid decreases.
Reason: In Frenkel defect, cation and anion leaves the crystal.
(a) Assertion is true but Reason is false.
(b) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(c) Both Assertion and Reason are false.
(d) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

Answer: (c) Both Assertion and Reason are false.

13.

14. How many geometrical isomers are possible for [Pt(Py) (NH3) (Br) (Cl)]?
(a) 0
(b) 3
(c) 15
(d) 4

Answer: (b) 3

15. Propan-2-ol on reaction with anhydrous ZnCl2 and concentrated HCl gives
(a) 1-chloropropane
(b) Ethyl chloride
(c) 2-chloro-2-methyl propane
(d) 2-chloropropane

Answer: (d) 2-chloropropane

TN HSC 2026 Chemistry Exam Analysis

The detailed TN Class 12 Chemistry exam analyis is available in the table below based on the students' feedbacks. Students can analyse their performance in general.

Particulars	Details
Overall Difficulty Level	Moderate
Was the Paper Lengthy?	Yes

The TN HSC 2026 Chemistry Answer Key Unofficial and TN HSC 2026 Chemistry Exam Analysis available here is only for students' reference. Students are advised to use the above answer key and analysis only for personal reference.

Students of the Tamil Nadu Board Commerce stream can check the Tamil Nadu HSC Accountancy Answer Key 2026 LIVE Updates: Detailed Question Paper Analysis available.

Live Updates

March 09, 2026 | 01:16 PM IST

TN HSC 2026 Chemistry Exam Concludes

The TN HSC 2026 Chemistry Exam has been concluded at 1:15 PM. Students can expect the detailed analysis and unofficial answer key soon.

March 09, 2026 | 12:23 PM IST

TN HSC 2026 Chemistry Mark Distribution & Evaluation

Overall Weightage: The 100-point total is broken down into 70 marks for the theory exam, 20 marks for practicals, and 10 marks for internal assessment.
Passing Criteria: Students must secure a minimum of 15 out of 70 in theory and an overall aggregate of 35 out of 100 to pass the subject.
Negative Marking: There is no negative marking for incorrect answers.

March 09, 2026 | 11:11 AM IST

TN HSC 2026 Chemistry Theory Paper Structure

The question paper is divided into four distinct parts:

Part I: Multiple Choice Questions (15 Marks)
- Consists of 15 compulsory objective-type questions.
- Each question carries 1 mark.
Part II: Very Short Answer Questions (12 Marks)
- Students must answer 6 out of 9 questions.
- Question No. 24 is compulsory.
- Each question carries 2 marks.
Part III: Short Answer Questions (18 Marks)
- Students must answer 6 out of 9 questions.
- Question No. 33 is compulsory.
- Each question carries 3 marks.
Part IV: Long Answer Questions (25 Marks)
- Consists of 5 questions, all of which must be answered.
- These questions follow an "either/or" (internal choice) format.
- Each question carries 5 marks.

March 09, 2026 | 10:42 AM IST

TN HSC 2026 Chemistry Exam Pattern

The Tamil Nadu Class 12 (HSC) Chemistry 2026 exam pattern consists of a 70-mark theory paper and a 30-mark internal/practical component, totaling 100 marks. The theory exam is conducted over 3 hours (with an additional 15 minutes for reading the question paper).

March 09, 2026 | 10:30 AM IST

TN HSC 2026 Chemistry Exam Timings

The TN HSC 2026 Chemistry exam is being held from 10 AM to 1:15 PM.