Chemistry · Class 12 Science

Puducherry Tnboard Class 12 Chemistry — Real Previous-Year Papers

with complete answers

Real previous-year board papers, year by year — the official exam pattern, the full question paper, and every question solved the concept-first way. Distinct from the chapter-wise textbook bank.

2017–2026
Years of papers: 8
Total Papers: 8
Real Board Papers: 0
Sample papers: 326
Real-paper Q & A: 0
Sample-paper Q & A

Real board-paper questions available, by year

38 Q2026complete

38 Q2025complete

38 Q2024complete

38 Q2023complete

38 Q2022complete

—2021Not available

—2020Not available

30 Q2019complete

54 Q2018complete

52 Q2017complete

Tamil Nadu HSC (DGE) Board 2026 · Set ANNUAL

Real board examination

About this paper

The real Class-12 board examination held in 2026. Every question below is solved the concept-first way. Sample papers are labelled honestly — never shown as a past exam.

Total marks: 70
Questions: 38
Duration: 180 min
Sections: 4

The marks / questions / duration above are the official exam pattern. We currently have 38 of this paper’s questions (100% of the full paper), with 38 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

Section	Type	Questions	Marks each	Total
ASection A	compulsory	15	1	15
BSection B	choice	9	2	18
CSection C	choice	9	3	27
DSection D	compulsory	5	5	25
Total		38		70

The question paper

The questions we hold for this paper, laid out by section. Solutions are on the Answers tab.

Board Examination

Chemistry

Tamil Nadu HSC (DGE) Board 2026 · Set ANNUAL

Series/Set: ANNUALRoll No. ________

Time Allowed: 3 hoursMaximum Marks: 70

General Instructions

This question paper contains 38 questions divided into 4 sections — A, B, C, D.
Section A comprises 15 questions of 1 mark each (compulsory).
Section B comprises 9 questions of 2 marks each (choice).
Section C comprises 9 questions of 3 marks each (choice).
Section D comprises 5 questions of 5 marks each (compulsory).

Above is the official exam pattern. The questions printed below are those we currently hold for this paper.

Section A

compulsory · 1 mark each · 15 of 15 shown

Q1.

Electrochemical process is used in the extraction of which of the following element ?

(a) Sodium
(b) Iron
(c) Silver
(d) Lead

[1]

Q2.

The stability of

+1

oxidation state increases in the sequence ________.

(a) In < Tl < Ga < Al
(b) Al < Ga < In < Tl
(c) Ga < In < Al < Tl
(d) Tl < In < Ga < Al

[1]

Q3.

XeF_6

on complete hydrolysis produces :

(a) $XeO_3$
(b) $XeOF_4$
(c) $XeO_2$
(d) $XeO_2F_2$

[1]

Q4.

Which of the following statements is incorrect ?

(a) $Co^{3+}$ and $Fe^{2+}$ 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 ( $E\degree$ ) of a metal is large and negative, the metal is a powerful oxidising agent.

[1]

Q5.

How many geometrical isomers are possible for

[Pt(Py)(NH_3)(Br)(Cl)]

(a) 0
(b) 3
(c) 15
(d) 4

[1]

Q6.

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.

[1]

Page 1 of 6

Q7.

The half life period of a radioactive element is 140 days. After 560 days 1 g of element will be reduced to : (a) ((1)/(8))g (b) ((1)/(2))g (c) ((1)/(16))g (d) ((1)/(4))g

[1]

Q8.

The pH of sodium formate solution in terms of Ka and the concentration of the electrolyte is : (a) pH = 7 - (1)/(2)pKa - (1)/(2)log C (b) pH = 7 - (1)/(2)pKa + (1)/(2)log C (c) pH = 7 + (1)/(2)pKa + (1)/(2)log C (d) pH = 7 + (1)/(2)pKa - (1)/(2)log C

[1]

Q9.

The molar conductivity of a 0.5moldm⁻³ solution of AgNO₃ with specific conductance 5.76 × 10⁻³Scm⁻¹ at 298 K is : (a) 0.086Scm²mol⁻¹ (b) 2.88Scm²mol⁻¹ (c) 28.8Scm²mol⁻¹ (d) 11.52Scm²mol⁻¹

[1]

Q10.

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.

[1]

Q11.

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

[1]

Q12.

CH₂=CH₂ xrightarrow[(ii) Zn/H₂O](i) O₃ X xrightarrowNH₃ Y 'Y' is : (a) Hexamethylene tetramine (b) Formaldehyde (c) Oxime (d) Diacetone ammonia

[1]

Q13.

C₆H₅NO₂ xrightarrowSn/HCl A xrightarrow[273K]NaNO₂/HCl B xrightarrow[283K]H₂O C 'C' is : (a) C₆H₅CHO (b) C₆H₅OH (c) C₆H₅NH₂ (d) C₆H₅CH₂OH

[1]

Q14.

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

[1]

Q15.

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

[1]

Page 2 of 6

Section B

choice · 2 marks each · 9 of 9 shown

Q1.

What is calcination ? Give an example.

[2]

Q2.

Mention the type of hybridisation in the following compounds. (a) BrF₅ (b) BrF₃

[2]

Q3.

Give the differences between double salts and coordination compounds.

[2]

Q4.

Write the rate law for the reaction in which the order with respect to the reactants X, Y and Z are 1/2, 3/2 and zero respectively.

[2]

Q5.

Explain the method by which colloidal solutions of ink and graphite are prepared.

[2]

Q6.

How will you convert phenol to phenolphthalein ?

[2]

Q7.

Give the tests for carboxylic acid group.

[2]

Q8.

How do antiseptics differ from disinfectants ?

[2]

Page 3 of 6

Q9.

Calculate the pH of 1.5 × 10⁻³ M solution of Ba(OH)₂.

[2]

Section C

choice · 3 marks each · 9 of 9 shown

Q1.

Give the basic requirement for vapour phase refining.

[3]

Q2.

Give the electronic configuration of Ce⁴⁺ and Co²⁺.

[3]

Q3.

Which type of isomerism is exhibited by the following compounds ? (a) [Co(NH₃)₄Br₂]Cl and [Co(NH₃)₄ClBr]Br (b) [Co(NH₃)₅NO₂]²⁺ and [Co(NH₃)₅ONO]²⁺ (c) [Pt(NH₃)₄][PdCl₄] and [Pd(NH₃)₄][PtCl₄]

[3]

Q4.

Calculate the percentage efficiency of packing in case of body centered cubic crystal.

[3]

Q5.

Prove that in case of first order reaction t99.9\% = 10t1/2.

[3]

Q6.

List any three characteristics of catalysts.

[3]

Page 4 of 6

Q7.

What are harmones ? Give examples.

[3]

Q8.

How is terylene prepared ?

[3]

Q9.

An organic compound (A) with molecular formula C₂H₇N reacts with nitrous acid to form compound (B) which is unstable. Hence compound (B) gets converted to compound (C). Compound (C) is used as a substitute for petrol. Identify compounds (A), (B) and (C).

[3]

Section D

compulsory · 5 marks each · 5 of 5 shown

Q1.

(a) (i) Write a short note on Gravity Separation process. (ii) Sulphuric acid is a dehydrating agent. Explain with suitable examples. **OR** (b) (i) Give any three uses of silicones. (ii) Write a short note on Fischer Tropsch synthesis.

[5]

Q2.

(a) What is Lanthanoid contraction ? What are the causes and effects of Lanthanoid contraction ? **OR** (b) Based on Valence bond theory, explain why the geometry of [Ni(CO)₄] is tetrahedral and [Ni(CN)₄]²⁻ is squareplanar.

[5]

Page 5 of 6

Q3.

(a) (i) Differentiate crystalline solids and amorphous solids. (ii) Explain the rate determining step with an example. **OR** (b) Derive an expression for Ostwald's dilution law.

[5]

Q4.

(a) (i) Explain the thermodynamics of cell reactions. (ii) Why salt bridge is used in Galvanic cells ? **OR** (b) How does diethyl ether react with the following ? (i) Cl₂/light (ii) dil H₂SO₄/H₂O (iii) CH₃COCl/anhydrousZnCl₂

[5]

Q5.

(a) Explain the mechanism of Cannizaro reaction. **OR** (b) (i) How will you convert benzene diazonium chloride to biphenyl ? Give the name of the reaction. (ii) How will you confirm the presence of keto group at C-2 carbon in Fructose molecule ?

[5]

Page 6 of 6