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Maharashtra HSC Chemistry Board Paper July 2025 with Solutions

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

2025, July 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 July 2025 (supplementary) examination (Day 06). The paper code printed on the question paper is J-371. 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−1 mol−1, atomic weight of oxygen = 16, NA = 6.022 × 1023, 1 F = 96500 C.

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) Coordination number of atoms in bcc crystal lattice is _____.

    1. (A) 2
    2. (B) 4
    3. (C) 6
    4. (D) 8
    1 mark See answer →

  2. Q.1 (ii) The unit of Henry’s Law constant is _____.

    1. (A) mol L–1 bar–1
    2. (B) mol–1 L bar–1
    3. (C) mol L–1 bar
    4. (D) mol–1 L–1 bar–1
    1 mark See answer →

  3. Q.1 (iii) pH of human blood is _____.

    1. (A) 6.9
    2. (B) 7.0
    3. (C) 7.4
    4. (D) 8.1
    1 mark See answer →

  4. Q.1 (iv) Ideal gas expands isothermally from 20 dm3 to 25 dm3 at constant pressure of 1.5 bar ; then work done in dm3 bar will be _____.

    1. (A) –1.5
    2. (B) –5
    3. (C) –7.00
    4. (D) –7.5
    1 mark See answer →

  5. Q.1 (v) Correct statement about electrolysis of aqueous NaCl is _____.

    1. (A) H2 gas liberated at cathode
    2. (B) Cl2 gas liberated at cathode
    3. (C) H2 gas liberated at anode
    4. (D) O2 gas liberated at anode
    1 mark See answer →

  6. Q.1 (vi) Rate constant of reaction is mole dm–3 sec–1, the order of reaction will be _____.

    1. (A) Zero
    2. (B) One
    3. (C) 1.5
    4. (D) 2
    1 mark See answer →

  7. Q.1 (vii) The correct possible general formula for interhalogen compound in the following is –

    1. (A) XX′2
    2. (B) XX′3
    3. (C) XX′4
    4. (D) XX′6
    1 mark See answer →

  8. Q.1 (viii) All radioactive elements are present in which of the following _____.

    1. (A) 3d series
    2. (B) 4d series
    3. (C) Actinoid series
    4. (D) Lanthanoid series
    1 mark See answer →

  9. Q.1 (ix) The metal used in preparation of Grignard reagent is _____.

    1. (A) Al
    2. (B) Mg
    3. (C) Na
    4. (D) Fe
    1 mark See answer →

  10. Q.1 (x) Which among the following is dicarboxylic acid –

    1. (A) Acetic acid
    2. (B) Phthalic acid
    3. (C) Caproic acid
    4. (D) Citric acid
    1 mark See answer →

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

  1. Q.2 (i) Write formula to calculate percent (%) atom economy of particular reaction.

    1 mark See answer →

  2. Q.2 (ii) Write name of monomer used to form nylon-6 polymer.

    1 mark See answer →

  3. Q.2 (iii) Write the total number of chiral carbon atoms present in glucose.

    1 mark See answer →

  4. Q.2 (iv) Complete the following reaction
    CH3–C(=O)–NH2 + 4[H] —(Na/C2H5OH or LiAlH4, ether / H3O+)→ ? + H2O

    1 mark See answer →

  5. Q.2 (v) Write name of reagent used to convert phenol to Benzene.

    1 mark See answer →

  6. Q.2 (vi) Write IUPAC name for [Structure: a benzene ring carrying a –CO–CH3 (acetyl) group and, on the adjacent (ortho) carbon, a –Cl atom.]

    1 mark See answer →

  7. Q.2 (vii) Write oxidation state of ‘Fe’ in [Fe(CN)6]4– complex ion.

    1 mark See answer →

  8. Q.2 (viii) When 6.0 g of O2 reacts with ClF as per
    2ClF(g) + O2(g) → Cl2O(g) + OF2(g)
    The enthalpy change is 38.55 kJ. Calculate the standard enthalpy of the reaction.

    1 mark See answer →

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

  1. Q.3 When gold crystallizes, it forms face-centered cubic cells. The unit cell edge length is 4 × 10–8 cm. Calculate the density of gold. Molar mass of gold is 197 g mol–1.

    2 marks See answer →

  2. Q.4 Define the following terms :
    (a) Isotonic solution
    (b) Colligative properties

    2 marks See answer →

  3. Q.5 A solution has hydrogen ion concentration 0.01 M. Calculate pOH of the same solution.

    2 marks See answer →

  4. Q.6 Derive the relation between ΔH and ΔU for gaseous phase reaction.

    2 marks See answer →

  5. Q.7 What is Salt bridge? Write the functions of salt bridge.

    2 marks See answer →

  6. Q.8 Distinguish between order and molecularity of a reaction.

    2 marks See answer →

  7. Q.9 Explain anomalous behaviour of Fluorine with respect to
    (i) Oxyacid (ii) Nature of hydrides
    (iii) Electronegativity (iv) Electron gain enthalpy

    2 marks See answer →

  8. Q.10 Balance the following chemical reactions.
    (i) K2Cr2O7 + KI + H2SO4 → K2SO4 + Cr2(SO4)3 + H2O + I2
    (ii) K2Cr2O7 + H2SO4 + H2S → K2SO4 + Cr2(SO4)3 + H2O + 3S

    2 marks See answer →

  9. Q.11 Write IUPAC names of following co-ordination ion / compound.
    (i) [Cu(NH3)4]2+
    (ii) Na3[AlF6]

    2 marks See answer →

  10. Q.12 Complete the following reactions –
    (i) CH3–CH=CH2 + HBr → ?
    (ii) C2H5OH + SOCl2 —(Δ)→ ?

    2 marks See answer →

  11. Q.13 Write chemical reactions for the preparation of phenol from isopropyl benzene.

    2 marks See answer →

  12. Q.14 Write a note on Haloform reaction.

    2 marks See answer →

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

  1. Q.15 A mixture of benzene and toluene contains 30% by mass of toluene. At 30 °C, vapour pressure of pure toluene is 36.7 mmHg and that of pure benzene is 118.2 mmHg. Assuming that the two liquids form ideal solution, calculate partial pressure of each constituent in the above solution at 30 °C.

    3 marks See answer →

  2. Q.16 Define :
    (i) Buffer solution
    (ii) Solubility product
    (iii) Common ion effect

    3 marks See answer →

  3. Q.17 Calculate maximum work done when 32 g of oxygen expanded isothermally and reversibly from pressure 2 bar to 1 bar at 298 K.

    3 marks See answer →

  4. Q.18 What is zero order reaction? Derive integrated rate law equation for zero order reaction.

    3 marks See answer →

  5. Q.19 (a) Write structures of :
    (i) Chlorous acid
    (ii) Perchloric acid
    (b) Write uses of Helium

    3 marks See answer →

  6. Q.20 (a) What is Lanthanoid contraction?
    (b) Compounds of ‘d’ block elements are coloured in solid state as well as in an aqueous state. Explain.

    3 marks See answer →

  7. Q.21 (a) Write the representation of sodium hexacyanoferrate (III)
    (b) Write type of hybridization and magnetic behaviour of the following –
    (i) [Co(NH3)6]3+
    (ii) [NiCl4]2–

    3 marks See answer →

  8. Q.22 Convert – (Indicate by reaction)
    (a) Acetic acid to ethyl acetate
    (b) Acetaldehyde to acetaldoxime
    (c) Acetone to propane

    3 marks See answer →

  9. Q.23 (a) What is the action of following on ethylamine –
    (i) Hinsberg reagent
    (ii) Nitrous acid
    (b) Write increasing order of basicity for CH3NH2, (CH3)2NH and (CH3)3N

    3 marks See answer →

  10. Q.24 (a) What are monosaccharides?
    (b) Draw Zwitter ion structure of α amino acid.
    (c) Write name of components of the nucleotide monomers.

    3 marks See answer →

  11. Q.25 (a) Write chemical reaction for preparation of Teflon.
    (b) Write structure of monomer of natural rubber.
    (c) Give two uses of high density polyethene [HDP].

    3 marks See answer →

  12. Q.26 Explain the following terms :
    (a) Sustainable development
    (b) Nanomaterial
    (c) Name the gamma isomer of BHC.

    3 marks See answer →

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

  1. Q.27 (a) Distinguish between crystalline and amorphous solids.
    (b) Explain bleaching action of chlorine in the presence of moisture.

    4 marks See answer →

  2. Q.28 (a) Draw neat and labelled diagram of standard hydrogen electrode.
    (b) Calculate e.m.f. of the following cell.
    Mg | Mg++(aq) || Ag+(aq) | Ag
    If E°Mg = –2.37 Volt and E°Ag = 0.8 Volt.

    4 marks See answer →

  3. Q.29 (a) State whether the following reaction is spontaneous or non spontaneous if ΔH = 50 kJ and ΔS = –130 JK–1 at 250 K.
    (b) Explain optical activity in 2-chlorobutane.
    (c) Write full name of DDT.

    4 marks See answer →

  4. Q.30 (a) Define Co-ordination number.
    (b) Write note on Reimer-Tieman reaction.
    (c) Write structural formula for methyl vinyl ether.

    4 marks See answer →

  5. Q.31 (a) Explain Aldol condensation reaction of ethanal.
    (b) Write four properties of interstitial compounds of transition elements.

    4 marks See answer →