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Chemistry · 2nd Puc Science

Karnataka PUC 2nd Puc Science 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
7
Total Papers
7
Real Board Papers
0
Sample papers
327
Real-paper Q & A
0
Sample-paper Q & A

Real board-paper questions available, by year

46 Q2026complete
46 Q2025complete
49 Q2024complete
—2023Paper not available
50 Q2022complete
—2021Paper not available
37 Q2020complete
37 Q2019complete
62 Q2018complete

2023 — Paper not available: We publish a Karnataka II PUC board question paper only after verifying it against the official printed original from the Department of Pre-University Education (KSEAB / DPUE). No such verified paper is available for this year, so we show none rather than an unconfirmed copy.

2021 — Paper not available: We publish a Karnataka II PUC board question paper only after verifying it against the official printed original from the Department of Pre-University Education (KSEAB / DPUE). No such verified paper is available for this year, so we show none rather than an unconfirmed copy.

Karnataka II PUC Board 2026 · Set V1

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
46
Duration
180 min
Sections
5

The marks / questions / duration above are the official exam pattern. We currently have 46 of this paper’s questions (100% of the full paper), with 46 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

SectionTypeQuestionsMarks eachTotal
ASection A15 MCQ + 5 Fill in the blanks — answer all20120
BSection BShort answer — answer any 35210
CSection CShort answer — answer any 5 (groups: any 3 + any 2)9327
DSection DLong answer — answer any 46530
ESection ENumerical problems — answer any 36318
Total4670

The question paper

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

Board Examination

Chemistry

Karnataka II PUC Board 2026 · Set V1

Series/Set: V1Roll No. ________
Time Allowed: 3 hoursMaximum Marks: 70

General Instructions

  1. This question paper contains 46 questions divided into 5 sections — A, B, C, D, E.
  2. Section A comprises 20 questions of 1 mark each (15 MCQ + 5 Fill in the blanks — answer all).
  3. Section B comprises 5 questions of 2 marks each (Short answer — answer any 3).
  4. Section C comprises 9 questions of 3 marks each (Short answer — answer any 5 (groups: any 3 + any 2)).
  5. Section D comprises 6 questions of 5 marks each (Long answer — answer any 4).
  6. Section E comprises 6 questions of 3 marks each (Numerical problems — answer any 3).

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

Section A

15 MCQ + 5 Fill in the blanks — answer all · 1 mark each · 20 of 20 shown

Q1.
The major product formed in the following reaction is H3C−CH2−CH∣Br−CH3→ΔAlc.KOH\text{H}_3\text{C}-\text{CH}_2-\underset{\underset{\text{Br}}{|}}{\text{CH}}-\text{CH}_3 \xrightarrow[\Delta]{\text{Alc.KOH}}
  • (a) 1-butene
  • (b) 2-butanol
  • (c) 1-bromobutane
  • (d) 2-butene
[1]
Q2.
The percentage of helium filled in the tanks used by most scuba divers to dilute air in deep dives
  • (a) 32.1
  • (b) 11.7
  • (c) 74.2
  • (d) 56.2
[1]
Q3.
The common oxidation state shown by the element with atomic number 21 is
  • (a) +3
  • (b) +4
  • (c) +5
  • (d) Both +3 and +5
[1]
Q4.
The main natural source of acetic acid is
  • (a) milk
  • (b) vinegar
  • (c) red ant
  • (d) butter
[1]
Q5.
Acetylation of salicylic acid produces a compound which has anti-inflammatory and antipyretic property. The compound is
  • (a) Bakelite
  • (b) Acetic anhydride
  • (c) Formalin
  • (d) Aspirin
[1]
Q6.
p-Hydroxyazobenzene is formed by the reaction of benzene diazonium chloride with phenol. It is
  • (a) an electrophilic substitution reaction
  • (b) a nucleophilic substitution reaction
  • (c) a hydrogenation reaction
  • (d) a halogenation reaction
[1]
Page 1 of 7
Q7.
Doctor advised a 50 year old woman enough exposure to sunlight and addition of fish and egg yolk to her diet. Name the vitamin deficiency for the possible disease diagnosed by the doctor, (a) Vitamin D (b) Vitamin A (c) Vitamin C (d) Vitamin B₁₂
[1]
Q8.
Which of the following statement/s is/are incorrect about order and molecularity of a chemical reaction? I. The probability that more than three molecules can collide and react simultaneously is very small. II. There can be only three values for the order of the reaction, that is zero, first and second. III. The order depends on rate equation while molecularity does not. IV. There can be infinite number of values for order. (a) I and IV (b) III only (c) II and IV (d) II only
[1]
Q9.
Which of the following groups when present at para position increases the basic strength of aniline? (a) -NO₂ (b) -Br (c) -NH₂ (d) -COOH
[1]
Q10.
Among the following cells, the cell used in the apollo space program for providing electric power is (a) SHE (b) H₂-O₂ fuel cell (c) Daniel cell (d) Mercury cell
[1]
Q11.
Isopropyl magnesium bromide and n-propyl magnesium bromide react separately with H₂O to yield the organic compounds, respectively are (a) Isopropyl bromide and n-propyl bromide (b) Isopropyl alcohol and n-propyl alcohol (c) n-propyl alcohol and Isopropyl alcohol (d) Propane and propane
[1]
Q12.
A binary solution has two components 'A' and 'B'. The mole fraction of components 'A' is 0.5, then the number of moles of components 'A' and 'B' in the solution is (a) nA > nB (b) nA < nB (c) nA = nB (d) zero
[1]
Q13.
Match the following given in List I with List II. | | List I (Elements) | | List II (Their maximum oxidation states) | | --- | --- | --- | --- | | i) | Thorium (Th) | a) | +7 | | ii) | Protactinium (Pa) | b) | +6 | | iii) | Lawrencium (Lr) | c) | +3 | | iv) | Uranium (U) | d) | +5 | | v) | Plutonium (Pu) | e) | +4 | Choose the correct option : (a) i – e, ii – d, iii – a, iv – b, v – c (b) i – e, ii – d, iii – c, iv – b, v – a (c) i – b, ii – a, iii – c, iv – e, v – d (d) i – b, ii – e, iii – c, iv – d, v – a
[1]
Q14.
The complex [Co(NH₃)₅(NO₂)]Cl₂ is obtained in the red form when nitrite ligand is bound to cobalt through oxygen (-ONO) and its Linkage isomer is obtained as a _____ form when nitrite ligand is bound to "Co" through nitrogen (-NO₂). (a) Orange (b) Blue (c) White (d) Yellow
[1]
Page 2 of 7
Q15.
Given below are two statements : Statement I : Alcohols are acidic in nature; The acidic character of alcohol is due to the polar nature of the O–H bond in it. Statement II : Alcohols are weaker acids than water. In the light of the above statements, choose the most appropriate answer from the options given below : (a) Statement I is incorrect but Statement II is correct (b) Both Statement I and Statement II are correct (c) Both Statement I and Statement II are incorrect (d) Statement I is correct but Statement II is incorrect
[1]
Q16.
Oxidation state of 'Ni' in [Ni(CO)₄] is ____.
[1]
Q17.
In Williamson ether synthesis, an alkyl halide is allowed to react with ____.
[1]
Q18.
The carbohydrates which reduce Fehling's solution and Tollens' reagent are called as ____ sugars.
[1]
Q19.
The lower aldehydes have sharp ____ odours.
[1]
Q20.
Van't Hoff factor (i) for a non-electrolyte in a solution is ____.
[1]
Section B

Short answer — answer any 3 · 2 marks each · 5 of 5 shown

Q1.
What are transition elements? Give an example.
[2]
Q2.
Write the SN2 mechanism involved in the conversion of chloromethane to methanol.
[2]
Q3.
What is half-life of a reaction? Represent it symbolically.
[2]
Page 3 of 7
Q4.
List any two nitrogeneous bases commonly found in both DNA and RNA.
[2]
Q5.
Write the products formed when anisole reacts with ethanoyl chloride in the presence of anhydrous AlCl₃ catalyst.
[2]
Section C

Short answer — answer any 5 (groups: any 3 + any 2) · 3 marks each · 9 of 9 shown

Q1.
Using Valance Bond Theory : account for hybridisation, geometry and magnetic property of [Co(NH₃)₆]³⁺ ion. [Given : Atomic number of cobalt is 27]
[3]
Q2.
What is lanthanoid contraction? Mention two consequence of it.
[3]
Q3.
Write the geometrical isomers of the complex [MX₂(L--L)₂], where "M", "X" and "L--L" are central metal atom/ion, monodentate ligand and didentate ligand respectively. Identify the optically inactive form of it.
[3]
Q4.
Complete the following chemical equations : i) ____ + 8Na₂CO₃ + 7O₂ longrightarrow 8Na₂CrO₄ + 2Fe₂O₃ + 8CO₂ ii) 2Na₂CrO₄ + ____ longrightarrow Na₂Cr₂O₇ + 2Na^+ + H₂O iii) Na₂Cr₂O₇ + 2KCl longrightarrow ____ + 2NaCl
[3]
Page 4 of 7
Q5.
Write the IUPAC name and structure of [Co₂(CO)₈] and mention the number of bridged "CO" groups.
[3]
Q6.
Derive an integrated rate equation for the rate constant of a first order reaction.
[3]
Q7.
Write a neat labelled diagram, cell representation and half-cell reaction of Standard Hydrogen Electrode (S.H.E.).
[3]
Q8.
What are ideal solutions? Write two characteristics of it.
[3]
Q9.
Mention any three factors which decides the products of electrolysis.
[3]
Section D

Long answer — answer any 4 · 5 marks each · 6 of 6 shown

Q1.
a) Name the two monosaccharides obtained when sucrose is subjected to hydrolysis. (2) b) What are non-essential amino acids? Mention the name of α-amino acid which is optically inactive. (2) c) Name the hormone which mediates responses to external stimuli. (1)
[5]
Page 5 of 7
Q2.
a) When an alkyl chloride reacts with sodium iodide in dry acetone gives alkyl iodide. (3) i) Name this reaction. ii) Write the general equation. iii) Mention the role of dry acetone. b) What is meant by racemic modification? “They are optically inactive”. Give reason. (2)
[5]
Q3.
a) Write the chemical equations involved in the preparation of methanamine through Gabriel Phthalimide synthesis. (3) b) Illustrate the carbylamine reaction with general chemical equation. (2)
[5]
Q4.
a) Write the steps involved in the mechanism of acid catalysed dehydration of ethanol to ethene. (3) b) Complete the following reactions ; (2) i) Phenol xrightarrow[H₂SO₄]Na₂Cr₂O₇ ___ ii) Phenol +3Br₂ longrightarrow ___ +3HBr
[5]
Q5.
Addition of H₂O to an organic compound with molecular formula C₃H₄ in the presence of Sulphuric acid and mercury (II) sulphate gives “A”. “A” oxidised with sodium hypoiodite gives “B” and “C”. When “A” is heated with barium hydroxide (catalyst) forms “D” by readily loss of water. “C”, upon heating with sodium hydroxide and calcium oxide in the ratio of 3 : 1 gives an organic compound “E”. Write the structures of “A”, “B”, “C”, “D” and “E”.
[5]
Q6.
a) Explain Hell-Volhard-Zelinsky reaction with chemical equation. (2) b) Write the chemical reaction for the conversion of toluene to benzaldehyde using chromyl chloride. Name the reaction. (2) c) Name the gas used to facilitate the nucleophilic addition of ethylene glycol to aldehydes and ketones. (1)
[5]
Page 6 of 7
Section E

Numerical problems — answer any 3 · 3 marks each · 6 of 6 shown

Q1.
Calculate the mass of a non-volatile solute which should be dissolved in 114 g octane to reduce its vapour pressure to 80%. [Given : Molecular formula of octane is C₈H₁₈, Molar mass of solute 40g mol⁻¹]
[3]
Q2.
The rate constant for the first order decomposition of H₂O₂ is given by the following equation : log k = 14.34 - 1.25×10⁴K/T Calculate Ea for the reaction. [Given : R = 8.314JK⁻¹mol⁻¹]
[3]
Q3.
The cell in which the reaction occurs 2Fe³⁺(aq) + 2I⁻(aq) leftharpoons 2Fe²⁺(aq) + I2(s); E°cell = 0.230 V at 298 K. Calculate the value of log Kc (Kc = equilibrium constant) of the cell reaction.
[3]
Q4.
1.00 g of a non-electrolyte solute dissolved in 50g of benzene lowered the freezing point of benzene by 0.40 K. The freezing point depression constant of benzene is 5.12K kg mol⁻¹. Find the molar mass of the solute.
[3]
Q5.
Calculate the limiting molar conductivity of Cl⁻ ion by using the data : λ°Ca²⁺ = 119.0S cm²mol⁻¹ and Lambda°m for CaCl₂ = 271.6S cm²mol⁻¹.
[3]
Q6.
A first order reaction takes 40 min for 30% decomposition. Calculate t1/2 (half-life period).
[3]
Page 7 of 7