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Maharashtra HSC Chemistry Board Paper March 2025 with Solutions

Written board papers. Physics and Chemistry: 70 marks, 3 hours. Mathematics & Statistics: 80 marks, 3 hours.

2025, March 180 minutes 70 marks Save WhatsApp

Sections

Section A : Q.1 Multiple choice questions (10 marks) 10 questions
Section A : Q.2 Very short answer questions (8 marks) 8 questions
Section B : Attempt any eight, Q.3 to Q.14 (16 marks) 12 questions
Section C : Attempt any eight, Q.15 to Q.26 (24 marks) 12 questions
Section D : Attempt any three, Q.27 to Q.31 (12 marks) 5 questions

About this paper

This is the Maharashtra State Board (MSBSHSE) HSC (Class 12) Science Chemistry (55) board paper of the February–March 2025 examination (Day 08). The paper code printed on the question paper is J-302. The duration is 3 hours and the paper carries 70 marks. The questions are transcribed from the board’s own printed question paper published on its website; structures and diagrams are described in words. The answers are original answers written by Doubtly, not the board’s official model answers.

Paper pattern

Four sections. Section A: Q.1 has ten MCQs (1 mark each) and Q.2 has eight very short answer questions (1 mark each), 18 marks, all compulsory. Section B: Q.3 to Q.14, twelve 2-mark questions, attempt any eight (16 marks). Section C: Q.15 to Q.26, twelve 3-mark questions, attempt any eight (24 marks). Section D: Q.27 to Q.31, five 4-mark questions, attempt any three (12 marks). Log tables are allowed, calculators are not. Data given on the paper: R = 8.314 J/K/mol, atomic mass Na = 23, Kf for water = 1.86 K kg mol−1, 1 F = 96500 C, NA = 6.022 × 1023.

How to use it

Attempt the paper in one 3-hour sitting, choosing questions the way the board allows, then compare your answers with the model answers: check the formula, substitution and units in each numerical, and the reagents and conditions in each organic reaction.

Chapters covered

Instructions

Solve on paper with a timer, then check against the solutions. Sections: A (MCQ and very short answers), B (short answers, attempt any 8 of 12), C (attempt any 8 of 12), D (long answers with choice).

Section A : Q.1 Multiple choice questions (10 marks)

  1. Q.1 (i) Schottky defect is NOT observed in _____.

    1. (A) NaCl
    2. (B) KCl
    3. (C) AgBr
    4. (D) NiO
    1 mark See answer →

  2. Q.1 (ii) The freezing point of 0.1m aqueous solution of urea, if \(K_f\) for water is 1.86 K kg mol−1 is _____.

    1. (A) 1.86 ºC
    2. (B) −1.86 ºC
    3. (C) 0.186 ºC
    4. (D) −0.186 ºC
    1 mark See answer →

  3. Q.1 (iii) Ozone layer is depleted by _____.

    1. (A) NO
    2. (B) NO2
    3. (C) NO3
    4. (D) N2O5
    1 mark See answer →

  4. Q.1 (iv) When excess of AgNO3 is added to a complex, one mole of AgCl is precipitated. The formula of complex is _____.

    1. (A) [CoCl2(NH3)4]Cl
    2. (B) [CoCl(NH3)5]Cl2
    3. (C) [CoCl3(NH3)3]
    4. (D) [Co(NH3)6]Cl3
    1 mark See answer →

  5. Q.1 (v) The value of \(\Delta n_g\) for the oxidation of 4 mole of sulphur dioxide to sulphur trioxide is _____.

    1. (A) −2
    2. (B) 2
    3. (C) −4
    4. (D) 4
    1 mark See answer →

  6. Q.1 (vi) One dimensional nanostructure amongst the following is _____.

    1. (A) Nanoparticles
    2. (B) Nanotubes
    3. (C) Nanofilms
    4. (D) Nanorods
    1 mark See answer →

  7. Q.1 (vii) Which formula co-relates degree of dissociation and concentration of electrolyte?

    1. (A) \(c = \sqrt{\dfrac{K_a}{\alpha}}\)
    2. (B) \(\alpha = \sqrt{\dfrac{K_a}{c}}\)
    3. (C) \(c = \sqrt{K_a\,\alpha}\)
    4. (D) \(c = \sqrt{\dfrac{\alpha}{K_a}}\)
    1 mark See answer →

  8. Q.1 (viii) The highest acidic compound among the following is _____.

    1. (A) [Structure: benzoic acid with OH at the meta position (m-hydroxybenzoic acid)]
    2. (B) [Structure: benzoic acid with NH2 at the ortho position (o-aminobenzoic acid)]
    3. (C) [Structure: benzoic acid]
    4. (D) [Structure: benzoic acid with OCH3 at the para position (p-methoxybenzoic acid)]
    1 mark See answer →

  9. Q.1 (ix) The formula used to calculate molar conductivity of an electrolyte is _____.

    1. (A) \(\Lambda = \dfrac{1000c}{k}\)
    2. (B) \(c = \dfrac{1000\Lambda}{k}\)
    3. (C) \(\Lambda = \dfrac{1000k}{c}\)
    4. (D) \(k = \dfrac{1000}{\Lambda c}\)
    1 mark See answer →

  10. Q.1 (x) Which of the following is a secondary amine?

    1. (A) Cyclohexylamine
    2. (B) Isopropylamine
    3. (C) Diphenylamine
    4. (D) N, N-Dimethylaniline
    1 mark See answer →

Section A : Q.2 Very short answer questions (8 marks)

  1. Q.2 (i) Write the structural formula of N, N-dimethylethanamine.

    1 mark See answer →

  2. Q.2 (ii) Write the reagents used for the reduction of carbonyl group in Clemmensen’s reduction.

    1 mark See answer →

  3. Q.2 (iii) Write the IUPAC name of isoprene.

    1 mark See answer →

  4. Q.2 (iv) The rate law equation for A → Product, is rate = k[A]x. What is the effect of increase in concentration of ‘A’ on rate of reaction, if x < 0?

    1 mark See answer →

  5. Q.2 (v) What is the molality of an aqueous solution of KBr having freezing point −3.72ºC (Kf for water is 1.86 K kg mol−1)?

    1 mark See answer →

  6. Q.2 (vi) Write the balanced chemical equation, when excess of ammonia is treated with chlorine.

    1 mark See answer →

  7. Q.2 (vii) Write the number of donor atoms present in EDTA, during formation of complex.

    1 mark See answer →

  8. Q.2 (viii) Write the names of the metal elements in brass alloy.

    1 mark See answer →

Section B : Attempt any eight, Q.3 to Q.14 (16 marks)

  1. Q.3 Derive the relation between half life and rate constant for a first order reaction.

    2 marks See answer →

  2. Q.4 (a) State Henry’s law.
    (b) Define : Osmotic pressure

    2 marks See answer →

  3. Q.5 Write the differences between lanthanoids and actinoids.

    2 marks See answer →

  4. Q.6 Write anomalous behaviour of oxygen with respect to :
    (i) Atomicity
    (ii) Oxidation state
    (iii) Magnetic property
    (iv) Nature of hydrides.

    2 marks See answer →

  5. Q.7 What is the action of :
    (i) Liquid bromine in acetic acid on anisole.
    (ii) Soda-lime on sodium acetate?

    2 marks See answer →

  6. Q.8 Calculate the work done in kJ in a reaction, if volume of the reactant decreases from 8 dm3 to 4 dm3 against 43 bar pressure. [ 1 dm3. bar = 100J ]

    2 marks See answer →

  7. Q.9 Explain ionization isomers with suitable example in complexes.

    2 marks See answer →

  8. Q.10 Write preparation of glucose from sucrose.

    2 marks See answer →

  9. Q.11 How many coulombs of electricity is required to produce 1g of sodium metal by reduction of sodium ion?

    2 marks See answer →

  10. Q.12 Write the structural formula and IUPAC name of the alcohol having molecular formula C4H10O which does not undergo oxidation under normal condition.

    2 marks See answer →

  11. Q.13 Identify ‘A’ and ‘B’ in the following reaction and rewrite the complete reaction :

    \(\mathrm{CH_3\text{-}CH=CH_2 \xrightarrow[Peroxide]{HBr} A \xrightarrow[-KBr]{alcoholic\ KCN} B}\)

    2 marks See answer →

  12. Q.14 Write the reaction for the preparation of :
    (i) acetaldehyde by Rosenmund reaction.
    (ii) benzaldehyde by Gatterman-Koch formylation.

    2 marks See answer →

Section C : Attempt any eight, Q.15 to Q.26 (24 marks)

  1. Q.15 Write the general electronic configuration of 3d series. Draw the structures of sulphuric acid and thiosulphuric acid.

    3 marks See answer →

  2. Q.16 Define conjugate acid-base pair. The hydroxyl ion concentration in aqueous solution of NaOH is 2 × 10−4 mol dm−3. Calculate pH of the solution.

    3 marks See answer →

  3. Q.17 What is atom economy? Explain any two applications of nanomaterials.

    3 marks See answer →

  4. Q.18 What is peptide bond? How is it formed? Write the name and formula of the reagent used to convert alkylhalide to nitroalkane.

    3 marks See answer →

  5. Q.19 (a) Write the reactions for the action of following reagents on phenol :
    (i) Nitrating mixture
    (ii) Zinc dust
    (b) What is the action of phosphorous pentacholoride on ethyl methyl ether?

    3 marks See answer →

  6. Q.20 (a) Write the formula to calculate EAN.
    (b) Explain formation of [Co(NH3)6]3+ complex ion with respect to :
    (i) Type of hybridisation
    (ii) Magnetic property

    3 marks See answer →

  7. Q.21 (a) Calculate spin only magnetic moment of M2+ ion. [ atomic number of M = 26 ]
    (b) Write condensed electronic configuration of Gadolinium [ Z = 64 ].

    3 marks See answer →

  8. Q.22 (a) Write the reducing agents used to convert Fe2O3 to ‘Fe’ in the reduction zone of blast furnace.
    (b) Write chemical equations involved in :
    (i) Carbylamine reaction for ethylamine.
    (ii) Hoffmann Bromamide degradation for acetamide.

    3 marks See answer →

  9. Q.23 (a) Explain Cannizzaro’s reaction with the help of benzaldehyde.
    (b) Write the reaction for the conversion of cyclohexene to adipic acid.

    3 marks See answer →

  10. Q.24 Define zero order reaction.
    A reaction takes place in two steps :
    (i) NO(g) + Cl2(g) → NOCl2(g)
    (ii) NOCl2(g) + NO(g) → 2NOCl(g)
    Write the overall reaction and identify the reaction intermediate.

    3 marks See answer →

  11. Q.25 \(\Delta H\) for formation of ethane gas is −84.4 kJ at 300 K. Calculate \(\Delta U\) for the reaction.

    3 marks See answer →

  12. Q.26 Mention the types of polymers formed on the basis of intermolecular forces. Write any two uses of low density polyethylene.

    3 marks See answer →

Section D : Attempt any three, Q.27 to Q.31 (12 marks)

  1. Q.27 (a) An element with molar mass 27 g/mol forms a cubic unit cell with edge length 405 pm. If density of the crystal is 2.7 g cm−3, identify the type of unit cell.
    (b) Derive the equation of Raoult’s law for binary solution containing non-volatile solute.

    4 marks See answer →

  2. Q.28 (a) State whether entropy change is positive or negative in the following examples :
    (i) Melting of ice
    (ii) Vaporisation of a liquid
    (b) Explain ‘common ion effect’ with example.

    4 marks See answer →

  3. Q.29 Draw a neat and labelled diagram of a lead accumulator cell. Write the overall reactions taking place at cathode and anode during discharging of the cell.

    4 marks See answer →

  4. Q.30 (a) Define a unit cell. Which colour is shown by NaCl crystal due to formation of F-centre?
    (b) Why does fluorine show anomalous behaviour in ‘17 group’ elements?

    4 marks See answer →

  5. Q.31 (a) Write salient features of SN2 mechanism.
    (b) What is the action of following reagents on bromomethane :
    (i) bromobenzene
    (ii) mercurous fluoride

    4 marks See answer →