HPBOSE 12th Chemistry Sample Paper 2026

Series–B

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Roll No.…………………….

Total No. of Questions–28            [Total No. of Printed Pages–16]

A–855–B–XII–2325

CHEMISTRY
(Theory)

Time Allowed—3 Hours            Maximum Marks—60

Candidates are required to give their answers in their own words as far as practicable.

Marks allotted to each question are indicated against it.

Special Instructions :

1. You must write Question Paper Series in the circle at top left side of title page of your Answer-book.
2. While answering your Questions, you must indicate on your Answer-book the same Question No. as appears in your Question Paper.
3. Do not leave blank page/pages in your Answer-book.
4. All questions are compulsory. Answer all parts of a question together.
5. Internal choices are given in some questions.
6. Answers should be brief and to the point.
7. Question Nos. 1 to 12 are MCQ (Multiple Choice Questions) carrying 1 mark each.
   Question Nos. 13 to 19 are very short answer type questions carrying 2 marks each.
   Question Nos. 20 to 24 are short answer type questions carrying 3 marks each.
   Question No. 25 is case study based question and carries 4 marks.
   Question Nos. 26 to 28 are long answer type questions carrying 5 marks each.
8. All questions given in Section–A (Multiple Choice Questions) are to be attempt on OMR sheet provided with Answer book.

SECTION–A
(Multiple Choice Questions)

1. Molarity of pure water is :

(a) 18

(b) 5.56

(c) 55.5

(d) 100

1

2. Value of one Faraday (1F) of electricity is approximately equal to :

(a) 96200 C

(b) 96500 C

(c) 96000 C

(d) 1.6×10^–19 C

1

3. CuSO₄ solution can not be stored in a vessel made up of :

(a) Zinc

(b) Glass

(c) Copper

(d) Plastic

1

4. A strong electrolyte :

(a) Does not dissociate into ions.

(b) Dissociate into ions completely.

(c) Dissociate into ions but not completely.

(d) None of these.

1

5. Aliphatic and Aromatic primary amine when heated with chloroform (CHCl₃) and alcoholic solution of KOH, Isocyanide having unpleasant smell is formed. This reaction is known as :

(a) Carbylamine reaction.

(b) Stephen sveta.

(c) Sandmayer reaction.

(d) Swartz reaction.

1

6. Heaviest transition metal is :

(a) Fe

(b) Cu

(c) Cr

(d) Os

1

7. CH₃COO Ag + Br₂ CCl₄ →
The product of this reaction is :

(a) CH₃CH₂Br + CO₂ + AgBr

(b) CH₃CH₂Cl + CO₂ + AgBr

(c) CH₃Cl + CO₂ + AgBr

(d) CH₃Br + CO₂ + AgBr

1

8. IUPAC name of CH₃–C–CH₂CH₃ is :

(a) Butane – 2 – al

(b) Butan – 2 – one

(c) Butane – 3 – one

(d) 2 – methyl propane – 1 – one

1

9. The correct order of increasing boiling point is :

(a) CH₃CH₂CH₂CHO < CH₃CH₂CH₂CH₂CH₃ < CH₃CH₂CH₂CH₂OH < C₂H₅OC₂H₅

(b) CH₃CH₂CH₂CH₂CH₃ < C₂H₅OC₂H₅ < CH₃CH₂CH₂CHO < CH₃CH₂CH₂CH₂OH

(c) CH₃CH₂CH₂CH₂OH < C₂H₅OC₂H₅ < CH₃CH₂CH₂CHO < CH₃CH₂CH₂CH₂CH₃

(d) None of these.

1

10. Which kinds of isomers are exhibited by [Co(NH₃)₅Br]SO₄ ?

(a) Geometrical and Ionization

(b) Optical and Ionization

(c) Geometrical and Optical

(d) Ionization only

1

11. The reason for high boiling point of alcohols as compared to isomeric ethers is :

(a) Solubility of alcohols in water

(b) Hydrogen bonding

(c) Association of molecules due to hydrogen bonding

(d) Van der Waal forces

1

12. The unit of rate constant for a zero order reaction is :

(a) mol L^–1 s^–1

(b) s^–1

(c) L mol^–1 s^–1

(d) mol L^–1 s^–1

1

SECTION–B
(Very Short Answer Type Questions)

13. Define half-life period. Establish the relation between λ and t_1/2 of the first order reaction. 2

14. What do you mean by geometrical isomerism ? Give example of geometrical isomers with coordination number 4 and 6. 2

15. Phenol on oxidation with air gives 2

16. Distinguish between Molality and Normality. 2

17. Arrange the following in decreasing order of their acidic strength : CH₃COOH, CH₂FCOOH, CH₃CH₂COOH, CHF₂COOH 2

18. Give IUPAC name : CH₃–CO–CH₂–CH₂–CH₂–COOH 2

19. Write the chemical test to distinguish between acetaldehyde and acetone. 2

SECTION–C
(Short Answer Type Questions)

20. Derive the Nernst equation for the electrode potential at 25°C. Mⁿ⁺ + ne^– → M(s) 3

21. Give one chemical test to distinguish between primary, secondary and tertiary aliphatic amines. Explain their behaviour towards nitrous acid. 3

22. How does toluene react with chromic acid ? 3

23. Explain why most of the transition elements form complex compounds. 3

24. In a first order reaction, the reactant concentration decreases from 0.8 M to 0.4 M in 15 min. What is the time taken to reach 0.1 M ? 3

SECTION–D
(Case Study Based Question)

Read the passage and answer the questions that follow :

A galvanic cell consists of a metallic zinc plate immersed in 0.1 M ZnSO₄ solution and a metallic copper plate immersed in 0.01 M CuSO₄ solution. The two half-cells are connected by a salt bridge containing KNO₃ solution. The standard reduction potentials are :

E°(Zn²⁺/Zn) = –0.76 V, E°(Cu²⁺/Cu) = +0.34 V

25.

(i) Write the cell representation.

(ii) Identify the anode and cathode.

(iii) Calculate the EMF of the cell at 298 K.

(iv) What will be the effect on EMF if concentration of Zn²⁺ is increased?

4

SECTION–E
(Long Answer Type Questions)

26. (a) Explain the amphoteric behaviour of amino acids.
(b) What happens when D-glucose is treated with :
   (i) HI    (ii) Br₂ water    (iii) HNO₃

OR

(a) Define the following with one example each :
   (i) Disaccharides    (ii) Polysaccharides    (iii) Denaturation of proteins
(b) What are essential and non-essential amino acids ? Give two examples of each. 5

27. (a) Explain the mechanism of nucleophilic addition reaction in carbonyl compounds.
(b) How will you convert :
   (i) Benzene to benzaldehyde    (ii) Acetaldehyde to acetone

OR

(a) Explain Cannizzaro reaction with mechanism.
(b) Why do carboxylic acids not give reactions of carbonyl group ? 5

28. (a) Calculate the packing efficiency in body-centered cubic (BCC) structure.
(b) What are Schottky and Frenkel defects ? Give one consequence of each.

OR

(a) State Kohlrausch’s law of independent migration of ions. Give its one application.
(b) The conductivity of 0.001 M acetic acid is 4.95 × 10^–5 S cm^–1. Calculate its dissociation constant if ∧°_m for acetic acid is 390.5 S cm² mol^–1. 5

Note : This sample paper is designed strictly according to the HPBOSE 2024–25 pattern for Class 12 Chemistry.

All questions are original but follow the exact blueprint: MCQs (12×1), VSA (7×2), SA (5×3), Case Study (1×4), LA (3×5).

For Practice Purpose Only – Best Wishes for HPBOSE 2026!