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Chemical Thermodynamics and Energetics

MHT-CET Chemistry. Try each one first, then open its answer.

Top 10 MHT-CET PYQs to practise first

The questions and kinds of question asked most often come first. Each one says how often and in which papers.

  1. Question 1

    This type asked 24 times: 1 in 2022, 7 in 2023, 5 in 2024, 4 in 2025, 7 in 2026. This one: 14 May 2026 S1 See all 24 of this type

    5
    In a particular reaction, 44 kJ of heat is released by the system and 88 kJ of work is done on the system. Determine the value of ΔU\Delta U.

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  2. Question 2

    This type asked 17 times: 1 in 2022, 5 in 2023, 2 in 2024, 4 in 2025, 5 in 2026. This one: 19 May 2026 S1 See all 17 of this type

    7
    A gas expands by 2500 cm32500\ \mathrm{cm^3} against constant external pressure 1.51.5 atm at constant temperature of 300300 K. Calculate the work of expansion in kJ.

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  3. Question 3

    This type asked 13 times: 10 May 2023 S1, 11 May 2023 S2, 16 May 2023 S1, 20 Apr 2025 S2, 23 Apr 2025 S1, 26 Apr 2025 S2, 11 Apr 2026 S1, 18 Apr 2026 S2, 20 Apr 2026 S1, 13 May 2026 S1, 13 May 2026 S2, 15 May 2026 S2, 19 May 2026 S1. This one: 19 May 2026 S1 See all 13 of this type

    6
    2 moles of an ideal gas expand isothermally and reversibly from 1010 L to 5050 L at 298298 K. Calculate the work done during this expansion. (R=8.314 JK−1 mol−1)(R = 8.314\ \mathrm{JK^{-1}\ mol^{-1}})

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  4. Question 4

    This type asked 13 times: 3 May 2023 S1, 15 May 2023 S1, 16 May 2023 S1, 9 May 2024 S1, 14 May 2024 S2, 25 Apr 2025 S1, 25 Apr 2025 S2, 13 Apr 2026 S1, 15 Apr 2026 S2, 18 Apr 2026 S1, 12 May 2026 S1, 14 May 2026 S1, 15 May 2026 S1. This one: 15 May 2026 S1 See all 13 of this type

    5
    For the following reaction, C(s)+2H2(g)→CH4(g); ΔrH0=−75 kJ\mathrm{C}(s) + 2\mathrm{H_2}(g) \rightarrow \mathrm{CH_4}(g);\ \Delta_r H^0 = -75\ \mathrm{kJ}. Calculate ΔG0\Delta G^0 if ΔS0\Delta S^0 is 185 JK−1185\ \mathrm{JK^{-1}}.

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  5. Question 5

    This type asked 10 times: 15 May 2023 S1, 11 May 2024 S1, 11 May 2024 S2, 14 May 2024 S2, 19 Apr 2025 S1, 21 Apr 2025 S1, 22 Apr 2025 S2, 11 Apr 2026 S2, 19 Apr 2026 S2, 15 May 2026 S1. This one: 15 May 2026 S1 See all 10 of this type

    6
    Calculate the work done in the following reaction NH4NO3(s)→N2O(g)+2H2O(g)\mathrm{NH_4NO_{3(s)} \rightarrow N_2O_{(g)} + 2H_2O_{(g)}} at 300300 K. [R=8.314 J K−1 mol−1R = 8.314\ \mathrm{J\ K^{-1}\ mol^{-1}}]

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  6. Question 6

    Asked 9 times: 2 May 2023 S2*, 10 May 2023 S2*, 11 May 2023 S1*, 10 May 2024 S2*, 12 May 2024 S2*, 13 May 2024 S2*, 13 Apr 2026 S2*, 19 Apr 2026 S1*, 20 Apr 2026 S2 (* = numbers or wording changed that year) See all 9 times it was asked

    6
    Calculate the change in internal energy if an ideal gas expands from 0.5 dm30.5\ \mathrm{dm^3} to 3.5 dm33.5\ \mathrm{dm^3} at constant pressure 2 bar by absorbing 1800 J heat energy.

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  7. Question 7

    This type asked 9 times: 20 Apr 2025 S2, 21 Apr 2025 S2, 22 Apr 2025 S1, 23 Apr 2025 S1, 26 Apr 2025 S2, 17 Apr 2026 S2, 18 Apr 2026 S2, 15 May 2026 S2, 19 May 2026 S2. This one: 19 May 2026 S2 See all 9 of this type

    7
    Evaluate the standard enthalpy of formation of C2H4\mathrm{C_2H_4} in kJ/mol from the following data, C2H4(g)+3O2(g)→2CO2(g)+2H2O(l)\mathrm{C_2H_{4(g)} + 3O_{2(g)} \to 2CO_{2(g)} + 2H_2O_{(l)}} ΔrH0=−1411\Delta_r H^0 = -1411 kJ/mol ΔfH0(CO2)=−393\Delta_f H^0(\mathrm{CO_2}) = -393 kJ/mol ΔfH0(H2O)=−285\Delta_f H^0(\mathrm{H_2O}) = -285 kJ/mol

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  8. Question 8

    This type asked 7 times: 11 May 2024 S2, 14 May 2024 S1, 19 Apr 2025 S1, 19 Apr 2025 S2, 26 Apr 2025 S1, 16 Apr 2026 S1, 19 May 2026 S2. This one: 19 May 2026 S2 See all 7 of this type

    6
    Calulate ΔS(total)\Delta S_{(total)} for following reaction. CH3OH(l)+3/2 O2(g)→CO2(g)+2H2O(l)\mathrm{CH_3OH_{(l)} + 3/2\,O_{2(g)} \to CO_{2(g)} + 2H_2O_{(l)}}, ΔH=−726 kJ mol−1\Delta H = -726\ \mathrm{kJ\ mol^{-1}}, ΔS(system)=42 JK−1\Delta S_{(system)} = 42\ \mathrm{JK^{-1}} (both at 298298 K)

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  9. Question 9

    This type asked 7 times: 3 May 2023 S2, 4 May 2023 S2, 13 Apr 2026 S2, 17 Apr 2026 S1, 20 Apr 2026 S2, 12 May 2026 S1, 14 May 2026 S2. This one: 14 May 2026 S2 See all 7 of this type

    7
    Calculate the heat of formation of SO2\mathrm{SO_2} from the following data, i) S+3/2 O2(g)→SO3(g)\mathrm{S} + 3/2\,\mathrm{O_2}(g) \rightarrow \mathrm{SO_3}(g), ΔH=−5Y\Delta H = -5Y kJ ii) SO2+1/2 O2(g)→SO3(g)\mathrm{SO_2} + 1/2\,\mathrm{O_2}(g) \rightarrow \mathrm{SO_3}(g), ΔH=−3Y\Delta H = -3Y kJ

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  10. Question 10

    Asked 6 times: 14 May 2024 S2*, 25 Apr 2025 S2*, 13 Apr 2026 S1*, 15 Apr 2026 S2*, 18 Apr 2026 S1*, 12 May 2026 S1 (* = numbers or wording changed that year) See all 6 times it was asked

    6
    For a certain reaction, change in enthalpy is −225-225 kJ and entropy change =−150 JK−1= -150\ \mathrm{JK^{-1}}. Find the temperature so that ΔG\Delta G is zero.

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