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Chemical Thermodynamics

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Every question from past board papers on Chemical Thermodynamics, newest paper first. Open any question for its full worked answer.

NEET UG 2025 question paper (official, booklet 45)

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  1. \(\mathrm{C(s) + 2H_2(g) \to CH_4(g)}\); \(\Delta H = -74.8\) kJ \(\mathrm{mol^{-1}}\)

    Which of the following diagrams gives an accurate representation of the above reaction? [R \(\to\) reactants; P \(\to\) products]

    Four energy vs reaction progress diagrams (1)-(4) with R, P, 74.8 kJ/mol arrow; options are the diagrams

    4 marks · See worked answer →

  2. The standard heat of formation, in kcal/mol of \(\mathrm{Ba^{2+}}\) is :

    [Given : standard heat of formation of \(\mathrm{SO_4^{2-}}\) ion (aq) = \(-216\) kcal/mol, standard heat of crystallisation of \(\mathrm{BaSO_4}\)(s) = \(-4.5\) kcal/mol, standard heat of formation of \(\mathrm{BaSO_4}\)(s) = \(-349\) kcal/mol]

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NEET UG 2024 question paper (official, booklet S6)

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  1. Match List I with List II.

    List I (Process): A. Isothermal process B. Isochoric process C. Isobaric process D. Adiabatic process

    List II (Conditions): I. No heat exchange II. Carried out at constant temperature III. Carried out at constant volume IV. Carried out at constant pressure

    Choose the correct answer from the options given below:

    4 marks · See worked answer →

  2. In which of the following processes entropy increases?

    A. A liquid evaporates to vapour.

    B. Temperature of a crystalline solid lowered from 130 K to 0 K.

    C. \(2NaHCO_{3(s)} \rightarrow Na_2CO_{3(s)} + CO_{2(g)} + H_2O_{(g)}\)

    D. \(Cl_{2(g)} \rightarrow 2Cl_{(g)}\)

    Choose the correct answer from the options given below:

    4 marks · See worked answer →

  3. The work done during reversible isothermal expansion of one mole of hydrogen gas at 25\(^\circ\)C from pressure of 20 atmosphere to 10 atmosphere is:

    (Given R = 2.0 cal \(K^{-1}\) \(mol^{-1}\))

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NEET UG 2023 question paper (official, booklet G6)

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  1. Which amongst the following options is the correct relation between change in enthalpy and change in internal energy?

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  2. The equilibrium concentrations of the species in the reaction A + B \(\rightleftharpoons\) C + D are 2, 3, 10 and 6 mol L\(^{-1}\), respectively at 300 K. \(\Delta G^\circ\) for the reaction is (R = 2 cal / mol K)

    4 marks · See worked answer →

NEET UG 2022 question paper (official, booklet R6)

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  1. Which of the following p-V curve represents maximum work done ?

    four p-V graphs each with an isothermal curve

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NEET UG 2021 question paper (official, booklet M4)

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  1. Which one among the following is the correct option for right relationship between \(C_P\) and \(C_V\) for one mole of ideal gas ?

    4 marks · See worked answer →

  2. The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cells is :

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  3. For irreversible expansion of an ideal gas under isothermal condition, the correct option is :

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NEET UG 2020 question paper (official, booklet E1)

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  1. Hydrolysis of sucrose is given by the following reaction.

    Sucrose + H\(_2\)O \(\rightleftharpoons\) Glucose + Fructose

    If the equilibrium constant (K\(_c\)) is \(2\times10^{13}\) at 300 K, the value of \(\Delta_rG^{\ominus}\) at the same temperature will be :

    4 marks · See worked answer →

  2. The correct option for free expansion of an ideal gas under adiabatic condition is :

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  3. For the reaction, 2Cl(g) \(\rightarrow\) Cl\(_2\)(g), the correct option is :

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NEET UG 2019 question paper (official, booklet P1)

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  1. Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is :

    [Given that 1 L bar = 100 J]

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  2. In which case change in entropy is negative ?

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NEET UG 2018 question paper (official, booklet EE)

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  1. Considering Ellingham diagram, which of the following metals can be used to reduce alumina ?

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  2. The bond dissociation energies of X\(_2\), Y\(_2\) and XY are in the ratio of 1 : 0.5 : 1. \(\Delta\)H for the formation of XY is \(-\)200 kJ mol\(^{-1}\). The bond dissociation energy of X\(_2\) will be

    4 marks · See worked answer →

NEET UG 2017 question paper (official, booklet B)

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  1. For a given reaction, \(\Delta H = 35.5\ kJ\ mol^{-1}\) and \(\Delta S = 83.6\ JK^{-1}mol^{-1}\). The reaction is spontaneous at : (Assume that \(\Delta H\) and \(\Delta S\) do not vary with temperature)

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  2. A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy \(\Delta U\) of the gas in joules will be :

    4 marks · See worked answer →

NEET UG 2016 Phase 1 question paper (official, booklet A)

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  1. The correct thermodynamic conditions for the spontaneous reaction at all temperatures is :

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  2. Consider the following liquid - vapour equilibrium.

    Liquid \(\rightleftharpoons\) Vapour

    Which of the following relations is correct ?

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NEET UG 2016 Phase 2 question paper (official, booklet ZZ)

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  1. For a sample of perfect gas when its pressure is changed isothermally from \(p_i\) to \(p_f\), the entropy change is given by

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