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Maharashtra HSC Chemistry Board Paper July 2024 with Solutions

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

2024, July 180 minutes 70 marks Save WhatsApp

Sections

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

About this paper

This is the Maharashtra State Board (MSBSHSE) HSC (Class 12) Science Chemistry (55) board paper of the July 2024 supplementary examination (Day 06, 23 July 2024). The paper code printed on the question paper is J-161. The questions are transcribed in full from the board’s own printed question paper, as published on the board’s official website; structures and figures are described in words. The answers are original answers written by Doubtly, not the board’s official model answers.

Paper pattern

Maximum marks 70, time 3 hours, 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. Constants given: R = 8.314 J K−1 mol−1, NA = 6.022 × 1023, F = 96500 C.

How to use it

Attempt the paper in one 3-hour sitting, choosing questions the way the board allows. Then compare with the answers: for numericals (Q.3, Q.7, Q.15, Q.18, Q.20, Q.30) check the formula, substitution with units and the final value; for organic questions check every reagent and condition written over the arrow.

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) Integrated rate law equation for a zero order reaction is –

    1. (A) \(Kt = [A]_0 - [A]_t\)
    2. (B) \(Kt = 2.303\log_{10}\dfrac{[A]_0}{[A]_t}\)
    3. (C) \(K = \dfrac{[A]_t - [A]_0}{t}\)
    4. (D) \(Kt = 2.303\log_{10}\dfrac{[A]_t}{[A]_0}\)
    1 mark See answer →

  2. Q.1 (ii) The spin only magnetic moment of Fe+2 ion is ____.

    1. (A) 3.806 BM
    2. (B) 4.899 BM
    3. (C) 5.796 BM
    4. (D) 6.817 BM
    1 mark See answer →

  3. Q.1 (iii) The relation between radius of sphere and edge length in simple cubic lattice is ____.

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

  4. Q.1 (iv) The monomer used in the preparation of thermocol is ____.

    1. (A) vinyl chloride
    2. (B) acrylamide
    3. (C) butadiene and acrylonitrile
    4. (D) styrene
    1 mark See answer →

  5. Q.1 (v) The pH of 0.01M solution of HCl is –

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

  6. Q.1 (vi) Which of the following α-amino acids do not contain chiral centre?

    1. (A) alanine
    2. (B) valine
    3. (C) leucine
    4. (D) glycine
    1 mark See answer →

  7. Q.1 (vii) Among the following benzylic halide is ____.

    1. (A) [Structure: benzene ring with X attached directly to a ring carbon (halobenzene)]
    2. (B) [Structure: benzene ring carrying a –CH2X group]
    3. (C) [Structure: cyclohexene ring with X attached to a carbon of the C=C double bond]
    4. (D) [Structure: benzene ring with –CH3 and, on the adjacent ring carbon, X (o-halotoluene)]
    1 mark See answer →

  8. Q.1 (viii) Neutral complex in the following is _____

    1. (A) [Co(NO2)3(NH3)3]
    2. (B) [Co(NH3)5CO3]Cl
    3. (C) Na3[Co(NO2)6]
    4. (D) [Co(C2O4)3]3−
    1 mark See answer →

  9. Q.1 (ix) The reaction used to convert toluene to benzaldehyde is known as :

    1. (A) Etard’s reaction
    2. (B) Gatterman-Koch formylation reaction
    3. (C) Friedel-Crafts reaction
    4. (D) Swartz reaction
    1 mark See answer →

  10. Q.1 (x) A better reagent to convert primary alcohol to aldehyde is ____.

    1. (A) chromic anhydride
    2. (B) pyridinium chlorochromate
    3. (C) potassium permanganate
    4. (D) potassium dichromate
    1 mark See answer →

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

  1. Q.2 (i) Write the name of insecticide which is effectively used instead of DDT.

    1 mark See answer →

  2. Q.2 (ii) Write the name of hydrocarbon formed when methyl magnesium iodide is treated with ammonia.

    1 mark See answer →

  3. Q.2 (iii) Calculate the standard potential of the following cell at 25ºC:

    Zn(s) | Zn2+ (0.08M) || Cr+3 (0.1M) | Cr(s)

    \(E^0_{Zn} = -0.76\) V, \(E^0_{Cr} = -0.74\) V

    1 mark See answer →

  4. Q.2 (iv) Write the IUPAC name of Na3[AlF6].

    1 mark See answer →

  5. Q.2 (v) Write the electronic configuration of Zn+2 ion. (Atomic number of zinc is 30).

    1 mark See answer →

  6. Q.2 (vi) Write the IUPAC name of amine formed when acetamide undergoes Hofmann bromamide degradation.

    1 mark See answer →

  7. Q.2 (vii) Write the condition for spontaneity of reaction with respect to entropy.

    1 mark See answer →

  8. Q.2 (viii) Write the relation between van’t Hoff factor and degree of dissociation of an electrolyte.

    1 mark See answer →

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

  1. Q.3 The normal boiling point of ethyl acetate is 77.06 ºC. A solution of 50 g of non-volatile solute in 150 g ethyl acetate boils at 82.60 ºC. Calculate molar mass of solute. [ Kb = 2.77ºC kg mol–1 ]

    2 marks See answer →

  2. Q.4 Deduce first law of thermodynamics for : (a) isothermal process (b) isochoric process

    2 marks See answer →

  3. Q.5 Complete the following equations :

    (i) XeF2 + H2O ⟶ ?

    (ii) Xe + F2 —(Electric discharge, Low temperature)→ ?

    2 marks See answer →

  4. Q.6 Differentiate between ionic crystals and covalent crystals.

    2 marks See answer →

  5. Q.7 What is the mass of Cu metal produced at the cathode during the passage of 5 ampere of current through CuSO4 solution for 100 minutes? [ Molar mass of Cu = 63.5 g mol–1 ]

    2 marks See answer →

  6. Q.8 Define Buffer solution. Write the Henderson Hasselbalch equation for acidic buffer.

    2 marks See answer →

  7. Q.9 Write two principles of green chemistry.

    2 marks See answer →

  8. Q.10 Write the preparation of Nylon-6 polymer and its two uses.

    2 marks See answer →

  9. Q.11 Define : (a) Pyrometallurgy. (b) Roasting.

    2 marks See answer →

  10. Q.12 Write salient features of SN1 mechanism.

    2 marks See answer →

  11. Q.13 What is the denaturation of proteins? Write the name of only pyrimidine base in RNA.

    2 marks See answer →

  12. Q.14 Write the reaction when ethylamine is treated with : (a) excess of ethyl bromide (b) Hinsberg’s reagent

    2 marks See answer →

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

  1. Q.15 Construct a cell using standard hydrogen electrode and zinc electrode. Write its cell reaction and cell representation. Calculate cell potential of a cell with 0.01 M Zn+2 ions. Standard potential of a cell is + 0.76 V.

    3 marks See answer →

  2. Q.16 State Henry’s Law. Write four conditions for ideal solutions.

    3 marks See answer →

  3. Q.17 Write one example of each of ionisation, linkage and hydrated isomerism.

    3 marks See answer →

  4. Q.18 Calculate the standard enthalpy of the reaction :

    SiO2(s) + 3C(graphite) → SiC(s) + 2CO(g) from the following reactions :

    (i) Si(s) + O2(g) → SiO2(s), ΔrH° = −911 kJ

    (ii) 2C(graphite) + O2(g) → 2CO(g), ΔrH° = −221 kJ

    (iii) Si(s) + C(graphite) → SiC(s), ΔrH° = −65.3 kJ

    3 marks See answer →

  5. Q.19 Derive Ostwald’s dilution law for weak acid. Obtain relation between solubility product and its solubility for Al(OH)3.

    3 marks See answer →

  6. Q.20 60% of the reactant decomposes in 45 minutes in a first order reaction. Calculate the half life period of the reaction. Write the relation between half life period and initial concentration for zero order reaction.

    3 marks See answer →

  7. Q.21 Write the conditions of colour of transition metal ion. Write the alloy used in Fischer Tropsch process.

    3 marks See answer →

  8. Q.22 Explain anomalous behaviour of oxygen with respect to atomicity, magnetic property and oxidation state.

    3 marks See answer →

  9. Q.23 Explain cross Cannizzaro reaction. Draw structure of Zwitter ion of sulfanilic acid.

    3 marks See answer →

  10. Q.24 Identify A, B, C and rewrite the chemical reactions :

    H3C–CH2Cl + KOH(aq) —(Δ)→ ‘A’ —(hot Cu powder)→ ‘B’ —(K2Cr2O7, dil H2SO4)→ ‘C’

    3 marks See answer →

  11. Q.25 Explain optical isomerism in 2-chlorobutane.

    3 marks See answer →

  12. Q.26 Write Clemmenson’s reduction reaction of propanone. Write Fehling solution test for ethanal.

    3 marks See answer →

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

  1. Q.27 How is dioxygen prepared in laboratory from KClO3? Write the chemical reaction to convert : (a) phenol to benzoquinone (b) phenol to cyclohexanol

    4 marks See answer →

  2. Q.28 Define : (a) Standard enthalpy of combustion. (b) Enthalpy of atomization. Draw the structure of D-ribose sugar. Write the uses of bronze alloy.

    4 marks See answer →

  3. Q.29 Distinguish between order and molecularity of a reaction. Write gases liberated at cathode and anode during electrolysis of aqueous NaCl solution. Write two uses of neon.

    4 marks See answer →

  4. Q.30 When gold crystallizes, it forms face-centred cubic cell. The unit cell edge length is 408 pm. Calculate the density of gold. [ Molar mass of gold = 197 g. mole–1 ] Which flower is an example of self cleaning? Write the monomer used for preparation of PVC.

    4 marks See answer →

  5. Q.31 Explain the formation of [Co(NH3)6]3+ ion on the basis of Valence bond theory. Convert the following : (a) acetic acid to ethyl acetate (b) acetic acid to ethyl alcohol.

    4 marks See answer →