Chemistry · Class 11 Science

Jammu Kashmir Jkbose 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: 15
Total Papers: 15
Real Board Papers: 0
Sample papers: 441
Real-paper Q & A: 0
Sample-paper Q & A

Real board-paper questions available, by year

31 Q2026complete

62 Q20252 sets

31 Q2024complete

81 Q20233 sets

27 Q2022complete

95 Q20213 sets

27 Q2020complete

27 Q2019complete

60 Q20182 sets

Jammu and Kashmir Board of School Education (Class 11) 2026 · Set sz

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: 31
Duration: 180 min
Sections: 4

The marks / questions / duration above are the official exam pattern. We currently have 31 of this paper’s questions (100% of the full paper), with 31 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	mcq	10	1	10
BSection B	subjective	9	2	18
CSection C	subjective	9	3	27
DSection D	subjective	3	5	15
Total		31		70

The question paper

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

Board Examination

Chemistry

Jammu and Kashmir Board of School Education (Class 11) 2026 · Set sz

Series/Set: szRoll No. ________

Time Allowed: 3 hoursMaximum Marks: 70

General Instructions

This question paper contains 31 questions divided into 4 sections — A, B, C, D.
Section A comprises 10 questions of 1 mark each (mcq).
Section B comprises 9 questions of 2 marks each (subjective).
Section C comprises 9 questions of 3 marks each (subjective).
Section D comprises 3 questions of 5 marks each (subjective).

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

Section A

mcq · 1 mark each · 10 of 10 shown

Q1.

Select the correct one: A pure substance which contains only one type of atoms is called

(a) An element
(b) A Compound
(c) A Solid
(d) A liquid

[1]

Q2.

Select the correct one: The number of molecules in 89.6 litre of a gas at NTP are:

(a) 6.023 x 10^23
(b) 2 x 6.023 x 10^23
(c) 3 x 6.023 x 10^23
(d) 4 x 6.023 x 10^23

[1]

Q3.

Select the correct one: The discovery of neutron came very late because

(a) It is present in nucleus
(b) It is a fundamental particle
(c) It does not move
(d) It does not carry any charge

[1]

Q4.

Select the correct one: Which is most acidic oxide

(a) Cl2O
(b) Cl2O3
(c) Cl2O5
(d) Cl2O7

[1]

Q5.

Select the correct one: Which one of the following is an extensive property

(a) Enthalpy
(b) Concentration
(c) Density
(d) Viscosity

[1]

Q6.

Select the correct one: In which of the following change entropy decreases?

(a) Crystallisation of sucrose from solution
(b) Dissolving sucrose in water
(c) Melting of ice
(d) Vaporisation of camphor

[1]

Page 1 of 5

Q7.

Select the correct one: The rate at which a substance reacts, depends on its: (a) Active mass (b) Molecular mass (c) Equivalent mass (d) Total volume

[1]

Q8.

Select the correct one: If pressure is applied to the equilibrium of solid <=> liquid, the melting point of a solid : (a) will not change (b) may increase or decrease depending upon its nature (c) will always increase (d) will always decrease

[1]

Q9.

Select the correct one: The oxidation state of chromium in chromium trioxide is (a) +3 (b) +4 (c) +5 (d) +6

[1]

Q10.

Select the correct one: Which one of the following is anti-aromatic. (a) cyclopropenyl cation (triangular three-membered ring with one double-bond line across the base and a '+' charge symbol at the apex carbon) (b) cyclopropenyl anion (same triangular ring, with a lone-pair/negative-charge symbol at the apex carbon) (c) cyclopropenyl ring with no charge symbol at the apex carbon (d) None of the above

[1]

Section B

subjective · 2 marks each · 9 of 9 shown

Q1.

Define law of multiple proportions. Explain with a suitable example.

[2]

Q2.

Consider the following species: N³-, O²-, F^-, Na^+, Mg²+ and Al³+ (a) What is common in them? (b) Arrange them in the order of increasing ionic radii

[2]

Q3.

Draw the Lewis structures for the following molecules and ions: HCOOH and NO3^-

[2]

Q4.

Which out of NH3 and NF3 has higher Dipole moment and why?

[2]

Page 2 of 5

Q5.

In a process, 701 j of heat is absorbed by a system and 394 j of work is done by the system. What is the change in internal energy for the process.

[2]

Q6.

Define entropy change and write units of entropy change.

[2]

Q7.

Predict if the solutions of the following salts are neutral, acidic or basic: NaCl, NaCN, NH4NO3 and KF.

[2]

Q8.

Write IUPAC names of the products obtained by the ozonolysis of the following compounds (a) Pent-2-ene (b) 1-phenylbut-1-ene

[2]

Q9.

What is difference between distillation and distillation under reduced pressure?

[2]

Section C

subjective · 3 marks each · 9 of 9 shown

Q1.

State and explain first law of thermodynamics. Give its mathematical form.

[3]

Q2.

Calculate the mass percent of different elements present in sodium sulphate (Na2SO4).

[3]

Page 3 of 5

Q3.

Explain, give reasons, which of the following sets of quantum numbers are not possible (a) n = 1, l = 0, m = 0, s = +1 (b) n = 2, l = 0, m = -1, s = +1/2 (c) n = 2, l = 2, m = +1, s = -1/2 (d) n = 2, l = 1, m = 0, s = -1/2 (e) n = 0, l = 1, m = 0, s = +1/2 (f) n = 3, l = 1, m = 0, s = -1/2

[3]

Q4.

Define electron affinity. What are its units. List three differences between electron affinity and Electronegativity.

[3]

Q5.

Explain the concept of Resonance with suitable examples and define Resonance energy.

[3]

Q6.

Define the following (a) pH of a solution (b) Solubility product (c) Common ion effect

[3]

Q7.

Discuss any three applications of redox reactions.

[3]

Q8.

Discuss the chemistry of lassaigne's test.

[3]

Q9.

Why is Wurtz reaction not preferred for the preparation of alkanes containing odd number of carbon atoms? Illustrate your answer by taking one example.

[3]

Page 4 of 5

Section D

subjective · 5 marks each · 3 of 3 shown

Q1.

(a) What is electromagnetic spectrum? (b) Explain Absorption spectrum. (c) How will you show that the spectral lines are the finger prints of the elements **OR** Write the main postulates of Bohr's theory. Explain the quantisation of energy. What are the limitations of Bohr's theory?

[5]

Q2.

Write the IUPAC names of the following compounds. (a) [Skeletal structure shown in the original paper] (b) [Ring structure with a side chain, shown in the original paper] (c) [Ring structure with a side chain, shown in the original paper] (d) [Ring structure with two substituents, shown in the original paper] (e) CH3-CH(OH)-CH2-CH(CHO)-COOH **OR** What are free radicals and carbanions? How are they generated? Explain the relative stability of alkyl free radicals and alkyl carbanions.

[5]

Q3.

Write notes on (a) Wurtz reaction (b) Corey-House alkane synthesis (c) Huckel's rule **OR** How will you prepare the following compounds from benzene? (a) Chlorobenzene (b) Nitrobenzene (c) Toluene (d) Benzene Sulphonic Acid. Give the mechanism of nitration of benzene.

[5]

Page 5 of 5