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Chemistry · Class 12 Science

Punjab Pseb 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.

2018–2026
Years of papers
5
Total Papers
5
Real Board Papers
0
Sample papers
169
Real-paper Q & A
0
Sample-paper Q & A

Real board-paper questions available, by year

40 Q2026complete
40 Q2025complete
—2024Not available
—2023Not available
—2022Not available
—2021Not available
37 Q2020complete
26 Q2019complete
26 Q2018complete

PSEB Punjab Class 12 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
21
Duration
180 min
Sections
4

The marks / questions / duration above are the official exam pattern. We currently have 40 of this paper’s questions (190% of the full paper), with 40 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

SectionTypeQuestionsMarks eachTotal
ASection Acompulsory111
BSection Bcompulsory14228
CSection Ccompulsory4312
DSection Dcompulsory2510
Total2170

The question paper

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

Board Examination

Chemistry

PSEB Punjab Class 12 Board 2026 · Set ANNUAL

Series/Set: ANNUALRoll No. ________
Time Allowed: 3 hoursMaximum Marks: 70

General Instructions

  1. This question paper contains 21 questions divided into 4 sections — A, B, C, D.
  2. Section A comprises 1 question of 1 mark each (compulsory).
  3. Section B comprises 14 questions of 2 marks each (compulsory).
  4. Section C comprises 4 questions of 3 marks each (compulsory).
  5. Section D comprises 2 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 · 20 of 1 shown

Q1.
Read the following paragraph and answer the question given below: Complete hydrolysis of DNA/RNA gives a pentane sugar, phosphoric acid and nitrogen containing heterolysis base. In DNA, sugar is β-D-2-deoxyribose and in RNA, sugar is β-D-ribose. DNA has four bases i.e. adenine, guanine, cytosine and thymine. In RNA instead of thymine, the bases is uracil and other three bases are same. Base attached to sugar forms nucleoside, while, sugar molecule joined to phosphate group and base forms nucleotide.
  • (i) Name the bases present in RNA.
[1]
Q2.
Read the following paragraph and answer the question given below: Complete hydrolysis of DNA/RNA gives a pentane sugar, phosphoric acid and nitrogen containing heterolysis base. In DNA, sugar is β-D-2-deoxyribose and in RNA, sugar is β-D-ribose. DNA has four bases i.e. adenine, guanine, cytosine and thymine. In RNA instead of thymine, the bases is uracil and other three bases are same. Base attached to sugar forms nucleoside, while, sugar molecule joined to phosphate group and base forms nucleotide.
  • (ii) What is nucleotide?
[1]
Q3.
Read the following paragraph and answer the question given below: Complete hydrolysis of DNA/RNA gives a pentane sugar, phosphoric acid and nitrogen containing heterolysis base. In DNA, sugar is β-D-2-deoxyribose and in RNA, sugar is β-D-ribose. DNA has four bases i.e. adenine, guanine, cytosine and thymine. In RNA instead of thymine, the bases is uracil and other three bases are same. Base attached to sugar forms nucleoside, while, sugar molecule joined to phosphate group and base forms nucleotide.
  • (iii) Name the sugar present in DNA.
[1]
Q4.
Read the following paragraph and answer the question given below: Complete hydrolysis of DNA/RNA gives a pentane sugar, phosphoric acid and nitrogen containing heterolysis base. In DNA, sugar is β-D-2-deoxyribose and in RNA, sugar is β-D-ribose. DNA has four bases i.e. adenine, guanine, cytosine and thymine. In RNA instead of thymine, the bases is uracil and other three bases are same. Base attached to sugar forms nucleoside, while, sugar molecule joined to phosphate group and base forms nucleotide.
  • (iv) Name the sugar present in RNA.
[1]
Page 1 of 6
Q5.
Read the following paragraph and answer the question given below: Complete hydrolysis of DNA/RNA gives a pentane sugar, phosphoric acid and nitrogen containing heterolysis base. In DNA, sugar is β-D-2-deoxyribose and in RNA, sugar is β-D-ribose. DNA has four bases i.e. adenine, guanine, cytosine and thymine. In RNA instead of thymine, the bases is uracil and other three bases are same. Base attached to sugar forms nucleoside, while, sugar molecule joined to phosphate group and base forms nucleotide. (v) Name the bases present in DNA.
[1]
Q6.
True/False: Ethers have dipole moment due to angular shape.
[1]
Q7.
True/False: Oxalato ion is tridentate ligand.
[1]
Q8.
True/False: Ethylene diamine is an example of bidentate ligand.
[1]
Q9.
True/False: Carboxylic acids are weaker acids than alcohols.
[1]
Q10.
True/False: Lower aldehydes are soluble in water.
[1]
Q11.
Cell used in wrist watch is: (a) Dry cell (b) Fuel cell (c) Mercury cell (d) None of these
[1]
Q12.
The half life period for first order reaction is ____ of its initial concentration. (a) Dependent (b) Independent (c) Property (d) None of these
[1]
Q13.
In cold countries ethylene glycol is added to water in radiators of cars during winter. This results in: (a) Lowering of freezing point (b) Reducing viscosity (c) Reducing specific heat (d) Making water better conductor of electricity
[1]
Q14.
Sea water is converted into fresh water based upon the phenomenon of: (a) Diffusion (b) Osmosis (c) Plasmolysis (d) Reverse Osmosis
[1]
Page 2 of 6
Q15.
When mercuric iodide is added to the aqueous solution of Potassium iodide: (a) Freezing point is raised (b) Freezing point does not change (c) Freezing point is lowered (d) Boiling point does not change
[1]
Q16.
Which is most acidic? (a) CF3COOH (b) CCl3COOH (c) CBr3COOH (d) CH3COOH
[1]
Q17.
Carboxylic acids are reduced by red P and HI to: (a) Alkanes (b) Alcohols (c) Alkenes (d) Aldehyde
[1]
Q18.
Stephen's reduction is used to prepare aldehyde from: (a) Alcohol (b) Alkyl cyanide (c) Alkanones (d) Acid chloride
[1]
Q19.
Which of the following species is not expected to be ligand? (a) NO (b) NH4+ (c) NH2CH2CH2NH2 (d) CO
[1]
Q20.
C2H5Cl on heating with alcoholic KOH will produce: (a) C2H5OH (b) C2H4 (c) C2H2 (d) C2H6
[1]
Section B

compulsory · 2 marks each · 14 of 14 shown

Q1.
How Phenol is converted into Picric acid? **OR** Explain esterification reaction.
[2]
Q2.
How will you convert benzene into benzophenone? **OR** Why do aldehyde and ketones have high dipole moment?
[2]
Q3.
Why methyl ammine has less boiling point than methanol?
[2]
Page 3 of 6
Q4.
Explain Coupling reaction.
[2]
Q5.
Give two differences between DNA and RNA.
[2]
Q6.
Define ideal solution and write one of its characteristic.
[2]
Q7.
Calculate the temperature at which a solution containing 54 g of glucose in 250 g of water will freeze. (Kf for water = 1.86 Kkg mol⁻¹). **OR** Calculate the molal elevation constant of water (Kb) Given that 0.1 molal aqueous solution of substance boils at 100.052°C.
[2]
Q8.
The molar conductivity at infinite dilution of Al2(SO4)3 is 858 S cm² mol⁻¹. Calculate the molar ionic conductivity of Al+3 ion, given that λ⁰(SO4⁻²) = 160 S cm² mol⁻¹.
[2]
Q9.
What are strong and weak electrolyte? Give one example of each.
[2]
Q10.
A first order reaction is found to have a rate constant k = 5.5×10⁻¹⁴ s⁻¹. Find the half life of the reaction. **OR** A first order reaction has a rate constant 1.15×10⁻³ s⁻¹. How long will 5 g of this reactant take to reduce 3 g?
[2]
Q11.
What is rate of reaction? Write two factors that effects the rate of reaction.
[2]
Page 4 of 6
Q12.
Explain why Cu+1 ion is not stable in aqueous solution.
[2]
Q13.
Define ligand. Give one example hexadentate ligand.
[2]
Q14.
Give two differences between Double salt and co-ordination compound.
[2]
Section C

compulsory · 3 marks each · 4 of 4 shown

Q1.
Write Kolbe's reaction to prepare Salicylic acid. **OR** Give reason for the higher boiling point of ethanol in comparison to methoxymethane.
[3]
Q2.
(a) Why is an amide more acidic than amine? [1.5] (b) Why does silver chloride dissolve in methylamine solution? [1.5]
[3]
Q3.
Write the Nerst Equation and calculate the e.m.f. of the following cell at 298 K Cu(s) | Cu+2(0.130M) || Ag+1(1.0×10⁻⁴) | Ag(s) Given E⁰(Cu+2/Cu) = +0.034 V E⁰(Ag+1/Ag) = +0.80 V **OR** Calculate the potential of Hydrogen electrode in contact with a solution whose pH is 10.
[3]
Q4.
In first order reaction is 20% complete in 10 minutes. Calculate the time for 75% completion of reaction.
[3]
Page 5 of 6
Section D

compulsory · 5 marks each · 2 of 2 shown

Q1.
(a) Give three differences between SN1 and SN2. [3] (b) How will you convert 2-Bromopropane to 1-Bromopropane? [2] **OR** (a) Write short note on: [1+1+1=3] (i) Finkelstein reaction (ii) Hunsdiecker reaction (iii) Wurtz reaction (b) How will you convert? [1+1=2] (i) Ethyl chloride into ethyl alcohol (ii) Ethyl chloride into ethane
[5]
Q2.
(a) What is lanthanide contraction? Give its causes. [3] (b) La(OH)3 is more basic than Lu(OH)3. Why? [2] **OR** (a) Scandium is transition element but Zinc is not, Explain. [3] (b) Chromium is a typical hard metal while mercury is liquid, Why? [2]
[5]
Page 6 of 6