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Chemistry · Class 12 Science

Mahe Dhse 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.

2013–2026
Years of papers
14
Total Papers
14
Real Board Papers
0
Sample papers
381
Real-paper Q & A
0
Sample-paper Q & A

Real board-paper questions available, by year

31 Q2026complete
31 Q2025complete
31 Q2024complete
31 Q2023complete
36 Q2022complete
40 Q2021complete
35 Q2020complete
33 Q2019complete
33 Q2018complete
16 Q2017complete
16 Q2016complete
16 Q2015complete
16 Q2014complete
16 Q2013complete

Kerala DHSE Plus Two 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
60
Questions
31
Duration
120 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

SectionTypeQuestionsMarks eachTotal
ASection Achoice515
BSection Bchoice10220
CSection Cchoice11333
DSection Dchoice5420
Total3160

The question paper

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

Board Examination

Chemistry

Kerala DHSE Plus Two Board 2026 · Set ANNUAL

Series/Set: ANNUALRoll No. ________
Time Allowed: 2 hoursMaximum Marks: 60

General Instructions

  1. This question paper contains 31 questions divided into 4 sections — A, B, C, D.
  2. Section A comprises 5 questions of 1 mark each (choice).
  3. Section B comprises 10 questions of 2 marks each (choice).
  4. Section C comprises 11 questions of 3 marks each (choice).
  5. Section D comprises 5 questions of 4 marks each (choice).

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

Section A

choice · 1 mark each · 5 of 5 shown

Q1.
In the electrolysis of molten NaCl, the substance liberated at the cathode is :
  • (a) Cl2
  • (b) Na
  • (c) H2
  • (d) O2
[1]
Q2.
The half-life of a first-order reaction depends on :
  • (a) Initial concentration
  • (b) Temperature only
  • (c) Rate constant
  • (d) Both
  • (a) and (c)
[1]
Q3.
Which of the following is a chelating ligand ?
  • (a) NH3
  • (b) H2O
  • (c) Cl-
  • (d) C2O4^2-
[1]
Q4.
Which of the following is least reactive towards nucleophilic substitution (SN1) ?
  • (a) Benzyl chloride
  • (b) Methyl chloride
  • (c) Chlorobenzene
  • (d) Allyl chloride
[1]
Q5.
Which of the following is a polysaccharide ?
  • (a) maltose
  • (b) sucrose
  • (c) fructose
  • (d) cellulose
[1]
Page 1 of 5
Section B

choice · 2 marks each · 10 of 10 shown

Q1.
Why saline water is mixed with medicine before injected into the blood of a patient ?
[2]
Q2.
The standard electrode potential for Daniel cell is 1.1 V. Calculate the standard Gibbs Energy change for the reaction : Zn (s) + Cu 2+ (aq) -> Zn 2+ (aq) + Cu (s).
[2]
Q3.
(i) Define activation energy. (1) (ii) Explain the effect of catalyst on the rate of chemical reaction. (1)
[2]
Q4.
The initial concentration of the first order reaction, N2O5 (g) -> 2NO2 (g) + 1/2 O2 (g), was 1.24 x 10^-2 mol L^-1 at 300 K. The concentration of N2O5 after 60 minutes was 0.20 x 10^-2 mol L^-1. Calculate the rate constant of the reaction at 300 K.
[2]
Q5.
Identify the products X and Y formed in the following reactions : (i) CH3CH2OH + PCl5 -> X + POCl3 + HCl (1) (ii) CH3Br + AgF -> Y + AgBr (1)
[2]
Q6.
Give two differences between SN1 and SN2 reactions.
[2]
Q7.
(i) In the presence of light, chloroform is slowly oxidised by air to an extremely poisonous gas called _____. (1) (ii) How is chlorobenzene converted into 1-chloro-2-methyl benzene ? (1)
[2]
Page 2 of 5
Q8.
How methanol is prepared industrially ? Write the chemical equation.
[2]
Q9.
Give one chemical test to distinguish between formaldehyde and acetaldehyde.
[2]
Q10.
How will you convert nitrobenzene to 2, 4, 6-Tribromo aniline ?
[2]
Section C

choice · 3 marks each · 11 of 11 shown

Q1.
200 cm³ of an aqueous solution of a protein contains 1.26 g of the protein. The osmotic pressure of such a solution at 300 K is found to be 2.57 x 10^-3 bar. Calculate the molar mass of the protein. (R = 0.083 L bar mol^-1 K^-1)
[3]
Q2.
Briefly explain the electrochemical processes involved in the rusting of iron.
[3]
Q3.
(i) Write any two differences between order and molecularity. (2) (ii) What do you mean by pseudo order reaction ? (1)
[3]
Q4.
Give reasons for the following : (i) Zn, Cd and Hg are not considered transition elements. (1) (ii) Transition metals form complex compounds. (1) (iii) Sc3+ is colourless, but Ti3+ is coloured. (1)
[3]
Page 3 of 5
Q5.
How do you prepare K2Cr2O7 from chromite ore ?
[3]
Q6.
(i) [Ni(CN)4]2- and [Ni(CO)4] have different structures, but do not differ in their magnetic behaviour. Explain. (2) (ii) Write the formula of Tetraamineaquachloridocobalt(III)chloride. (1)
[3]
Q7.
(i) Draw the diagram which indicates the splitting of d-orbitals in tetrahedral field. (2) (ii) Write any one limitation of valence bond theory. (1)
[3]
Q8.
Name the products formed when phenol is treated with the following reagents : (i) Bromine water (ii) Zinc dust (iii) Conc. HNO3
[3]
Q9.
Complete the following table : Row 1: Reactant RCOCl, Reagent H2, Pd/BaSO4 - find Major product and Name of reaction. Row 2: Reactant CH3COOH, Reagent Cl2/Red P - find Major product and Name of reaction. Row 3: Reactant CH3CHO, Name of reaction Clemmensen reduction - find Reagent and Major product.
[3]
Q10.
(i) The reaction in which an amide is converted into a primary amine by the action of Br2 and alcoholic NaOH is known as _____. (1) (ii) How is a primary amine distinguished from a secondary amine using Hinsberg test ? (2)
[3]
Q11.
(i) Differentiate between globular and fibrous proteins. (2) (ii) What is meant by denaturation of protein ? (1)
[3]
Page 4 of 5
Section D

choice · 4 marks each · 5 of 5 shown

Q1.
(i) State Henry's Law. Give two applications of it. (2) (ii) Draw the vapour pressure-mole fraction curve for a non-ideal solution having positive deviation, if A and B are the two volatile components. (2)
[4]
Q2.
(i) Write the cell reaction and Nernst equation for a Daniel cell. (2) (ii) Explain the variation of conductivity and molar conductivity of a solution with dilution. (2)
[4]
Q3.
(i) Write two postulates of Werner's Coordination theory. (2) (ii) Draw the geometrical isomers of [Co(NH3)3(NO2)3] and give their structures. (2)
[4]
Q4.
(i) Predict the products A and B : 3CH3-CH=CH2 + (H-BH2)2 -> A, then A with H2O2/OH- -> B. (2) (ii) Explain the preparation of phenol from cumene. (2)
[4]
Q5.
(i) Explain Aldol condensation with example. (2) (ii) How are the following conversions achieved : (a) Benzene -> Benzaldehyde (b) Ethanoic acid -> ethanol (2)
[4]
Page 5 of 5