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Chemistry · Class 11 Science

Mahe Dhse 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
9
Total Papers
9
Real Board Papers
0
Sample papers
291
Real-paper Q & A
0
Sample-paper Q & A

Real board-paper questions available, by year

31 Q2026complete
31 Q2025complete
31 Q2024complete
31 Q2023complete
31 Q2022complete
40 Q2021complete
35 Q2020complete
28 Q2019complete
33 Q2018complete

Kerala DHSE Plus One Board 2026 · Set ANN

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
—
Questions
—
Duration
—
Sections
—

The marks / questions / duration above are the official exam pattern. We currently have 31 of this paper’s questions, with 31 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

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 One Board 2026 · Set ANN

Series/Set: ANNRoll No. ________
Time Allowed: —Maximum Marks: —
Section Other

Other / unmarked

Q1.
Find the number of significant figures in the measurement, 0.04597 g.
[1]
Q2.
According to Pauling scale, the element with the highest electronegativity is _________.
[1]
Q3.
Identify the incorrect Lewis structure.
  • (a) O=C=O (each O with two lone pairs)
  • (b) N=O (N with a single unpaired electron, O with lone pairs)
  • (c) N(triple bond)N: (with lone pair on one N)
  • (d) H-C(triple bond)C-H
[1]
Q4.
Equilibrium constant (Kc) of a reaction depends on :
  • (a) temperature
  • (b) pressure
  • (c) catalyst
  • (d) initial concentration
[1]
Q5.
Write the structural formula of the given compound : But-2-en-1-ol
[1]
Q6.
Balanced equation for the combustion of methane is : CH4(g) + O2(g) -> CO2(g) + 2H2O(g). If 96 g of methane undergoes complete combustion, calculate the mass of carbon dioxide produced.
[2]
Page 1 of 5
Q7.
Calculate the radius of the third orbit of the hydrogen atom. (a0 = 52.9 pm)
[2]
Q8.
(i) Identify the correct electronic configuration of Carbon from the following : (1) (a) 1s2 2s2 2px2 (b) 1s2 2s2 2px1 2py1 (ii) Sketch the boundary surface diagram of px orbital. (1)
[2]
Q9.
Mention the two types of hydrogen bonding. Give one example for each type.
[2]
Q10.
Classify the following into state functions and path functions : internal energy, heat, work, Gibbs energy
[2]
Q11.
Explain common ion effect with a suitable example.
[2]
Q12.
What is meant by disproportionation reactions ? Give one example.
[2]
Q13.
Explain the detection of sulphur in an organic compound by using sodium fusion extract.
[2]
Q14.
Which of the following compounds are aromatic according to Huckel's rule? [I: benzene ring, II: naphthalene, III: a five-membered ring with two double bonds]
[2]
Page 2 of 5
Q15.
Identify the organic compound formed in the following reactions : (a) Benzene + CH3Cl --(Anhyd. AlCl3)--> (product) (1) (b) C2H5Br + 2Na + BrC2H5 --(dry ether)--> (product) (1)
[2]
Q16.
Define the following : (i) atomic mass unit (1) (ii) limiting reagent (1) (iii) Molarity (1)
[3]
Q17.
Explain the results obtained in the photoelectric effect experiment.
[3]
Q18.
(i) How does the ionization enthalpy vary from top to bottom in a group in the periodic table? Write the reason. (2) (ii) Among Be, Mg and Ca, (a) Which element has the highest first ionization enthalpy? (1/2) (b) Which element has the most metallic character? (1/2)
[3]
Q19.
(i) Define electron gain enthalpy. (1) (ii) Which among F and Cl has more negative electron gain enthalpy? Give reason. (2)
[3]
Q20.
Write the Molecular orbital configuration of N2. Calculate its bond order and also predict its magnetic behaviour.
[3]
Q21.
Calculate the standard enthalpy of formation of CH4(g) from the following data : CH4(g) + 2O2(g) -> CO2(g) + 2H2O(l); deltar H = -890 kJ mol^-1 C(graphite) + O2(g) -> CO2(g); deltaf H = -393 kJ mol^-1 H2(g) + 1/2 O2(g) -> H2O(l); deltaf H = -286 kJ mol^-1
[3]
Page 3 of 5
Q22.
What are buffer solutions? Explain the types of buffer solution with the help of suitable examples.
[3]
Q23.
Balance the following equation in basic medium : MnO4^-(aq) + I^-(aq) -> MnO2(s) + I2(s)
[3]
Q24.
Write the metamers of the compound C4H10O and give their IUPAC names.
[3]
Q25.
Draw Sawhorse projections for the eclipsed and staggered conformations of ethane. Which of these conformations is more stable?
[3]
Q26.
Predict the products obtained when CH3-CH=CH2 reacts with the following reagents : (i) H2/Ni (1) (ii) O3 and then Zn/H2O (2)
[3]
Q27.
Describe the information provided by all the four quantum numbers.
[4]
Q28.
(i) Write two postulates of VSEPR theory. (1) (ii) Based on VSEPR theory, explain the shapes of BF3, NH3 H2O. (3)
[4]
Page 4 of 5
Q29.
(i) Define the following : (a) Enthalpy (1) (b) Entropy (1) (ii) What are spontaneous processes? Predict the sign of delta G for such processes. (2)
[4]
Q30.
(i) Consider the equilibrium : N2(g) + 3H2(g) <=> 2NH3(g), delta H = -92.4 kJ mol^-1. Explain the effect of pressure and temperature on this equilibrium. (2) (ii) Calculate the pH of 0.02 M HCl. (2)
[4]
Q31.
(i) Briefly explain the following : (a) Electromeric effect (1) (b) Inductive effect (1) (ii) Differentiate homolytic fission from heterolytic fission. (2)
[4]
Page 5 of 5