Chemistry · Class 11 Science

Tamil Nadu Dge Class 11 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.

2018–2026
Years of papers: 8
Total Papers: 8
Real Board Papers: 0
Sample papers: 304
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

—2021No regular exam held this year

38 Q2020complete

38 Q2019complete

38 Q2018complete

2021 — No regular exam held this year: Tamil Nadu cancelled the March 2021 Class 9/10/11 Public Examinations outright (COVID-19 2nd wave) — students were promoted using their quarterly/half-yearly marks, so no genuine full-cohort exam was ever sat. The single "September 2021" paper on DGE’s own archive that year is a private-candidate/improvement sitting, not the regular annual exam, so it is not published here (mirrors this platform’s standing "main sitting only" convention, applied identically to TN-DGE’s Class-12 2021 papers).

Tamil Nadu HSC First Year (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
ISection I	mcq	15	1	15
IISection II	short_answer_choice	6	2	12
IIISection III	short_answer_choice	6	3	18
IVSection IV	long_answer_or	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 First Year (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 — I, II, III, IV.
Section I comprises 15 questions of 1 mark each (mcq).
Section II comprises 6 questions of 2 marks each (short_answer_choice).
Section III comprises 6 questions of 3 marks each (short_answer_choice).
Section IV comprises 5 questions of 5 marks each (long_answer_or).

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

Section A

Q1.

Which one of the following is used as a standard for atomic mass ?

(a) ^12_6 C
(b) ^12_7 C
(c) ^13_6 C
(d) ^14_6 C

[1]

Q2.

Electron density in the yz plane of 3d_xy orbital is :

(a) zero
(b) 0.50
(c) 0.75
(d) 0.90

[1]

Q3.

The element with positive electron gain enthalpy is :

(a) Hydrogen
(b) Sodium
(c) Argon
(d) Fluorine

[1]

Q4.

The cause of permanent hardness of water is due to :

(a) Ca(HCO3)2
(b) Mg(HCO3)2
(c) CaCl2
(d) MgCO3

[1]

Q5.

Assertion : Generally alkali and alkaline earth metals form superoxides. Reason : There is a single bond between O and O in superoxides.

(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 of assertion
(c) assertion is true but reason is false
(d) both assertion and reason are false

[1]

Q6.

Maximum deviation from ideal gas is expected from :

(a) CH4(g)
(b) NH3(g)
(c) H2(g)
(d) N2(g)

[1]

Q7.

In an adiabatic expansion of an ideal gas :

(a) w = -Δu
(b) w = Δu + ΔH
(c) Δu = 0
(d) w = 0

[1]

Page 1 of 6

Q8.

In the reaction H2(g) + I2(g) ⇌ 2HI(g), the value of Δng is : (a) 0 (b) 1 (c) -1 (d) 2

[1]

Q9.

Osmotic Pressure (π) of a solution is given by relation : (a) π = nRT (b) πV = nRT (c) πRT = n (d) None of these

[1]

Q10.

Which one of the following is diamagnetic ? (a) O2 (b) O2²- (c) O2^- (d) None of these

[1]

Q11.

In an Organic compound, Phosphorus is estimated as : (a) Mg2P2O7 (b) Mg3(PO4)2 (c) H3PO4 (d) P2O5

[1]

Q12.

Heterolytic fission of C-C bond results in the formation of : (a) Free radical (b) Carbanion (c) Carbocation (d) Carbanion and Carbocation

[1]

Q13.

Which of the following compounds will not undergo Friedel-Crafts reaction easily ? (a) Nitrobenzene (b) Toluene (c) Cumene (d) Xylene

[1]

Q14.

C - X bond is strongest in : (a) Chloromethane (b) Iodomethane (c) Bromo methane (d) Fluoromethane

[1]

Q15.

The pH of normal rain water is : (a) 6.5 (b) 7.5 (c) 5.6 (d) 4.6

[1]

Section B

Q1.

Distinguish between Oxidation and Reduction.

[2]

Q2.

Give the electronic configuration of Mn²+ and Cr³+.

[2]

Page 2 of 6

Q3.

Define Modern Periodic law.

[2]

Q4.

Would it be easier to drink water with a straw on the top of Mount Everest ?

[2]

Q5.

What is molal depression constant ?

[2]

Q6.

What is meant by functional group ?

[2]

Q7.

Why chlorination of methane is not possible in dark ?

[2]

Q8.

Name the gases that cause green house effect.

[2]

Q9.

Calculate the entropy change during the melting of ice into water at 0°C and 1 atm pressure. Enthalpy of fusion of ice is 6008 J mol^-1.

[2]

Section C

Q1.

Define orbital. What are the 'n' and 'l' values for 3px and 4d(x2-y2) electron ?

[3]

Page 3 of 6

Q2.

Give the uses of Gypsum.

[3]

Q3.

Explain the diagonal relationship.

[3]

Q4.

Explain how will you predict the direction of a equilibrium reaction.

[3]

Q5.

Define (i) Molality (ii) Normality.

[3]

Q6.

What type of hybridisation are possible in the following geometries ? (a) Octahedral (b) Tetrahedral (c) Square planar

[3]

Q7.

What are electrophiles and nucleophiles ? Give suitable examples for each.

[3]

Q8.

What happens when ethylene is passed through cold dilute alkaline Potassium Permanganate ?

[3]

Page 4 of 6

Q9.

Explain the preparation of the following compounds. (i) DDT (ii) Chloropicrin

[3]

Section D

Q1.

(a) (i) A compound on analysis gave the following percentage composition 76.6% carbon, 6.38% Hydrogen and 17.02% Oxygen. Determine the empirical formula of the compound. (3) (ii) State Pauli Exclusion Principle. (2) **OR** (b) Discuss the similarities between Beryllium and Aluminium. (5)

[5]

Q2.

(a) List the characteristics of Gibbs free Energy. (5) **OR** (b) (i) Compare the structures of H2O and H2O2. (3) (ii) Explain the exchange reaction of Deuterium. (2)

[5]

Q3.

(a) (i) Define the term "Isotonic solution". (2) (ii) Define Ideal Gas Equation. (3) **OR** (b) Derive the relation between Kp and Kc. (5)

[5]

Q4.

(a) Explain VSEPR theory. Applying this theory to predict the shapes of IF7 and SF6. (5) **OR** (b) (i) Complete the following: (2) a) CH3Br + KOH → b) CH3-O-CH3 + HI → (ii) Give the structure for the following compound. (3) (i) Acetaldehyde (ii) 3-ethyl-2-methyl-1-pentene (iii) 3-Chlorobutanol

[5]

Page 5 of 6

Q5.

(a) Explain the structure of benzene. (5) **OR** (b) (i) Write short notes on Friedel-Crafts reaction. (2) (ii) What are the various methods you suggest to protect our environment from pollution ? (3)

[5]

Page 6 of 6