Difficulty distribution
How the classified questions are distributed by difficulty.
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Practice Thermodynamics - Physical Chemistry - Chemistry previous year questions organised from real papers, with year-wise coverage and clear topic navigation.
Every graph below is calculated only from this selection.
Year-wise coverage for Thermodynamics. Each bar uses a separate theme-derived color.
How the classified questions are distributed by difficulty.
MCQ, numerical, multiple-select and other formats found in these papers.
Top subjects by unique question coverage.
Top topics across the included previous year papers.
Top subtopics inside this exact selection.
Question coverage for the most populated papers. Every active PYP paper remains listed below.
Newest papers appear first. Sort by year, question coverage or name.
| Paper | Year / session | Questions in this view | Open |
|---|---|---|---|
| KCET 2025 | 2025 | 3 | View paper |
| KCET 2024 | 2024 | 1 | View paper |
| KCET 2023 | 2023 | 3 | View paper |
| KCET 2022 | 2022 | 1 | View paper |
| KCET 2020 | 2020 | 1 | View paper |
| KCET 2019 | 2019 | 1 | View paper |
| KCET 2017 | 2017 | 1 | View paper |
Practice every matching question in batches of 20, with every available option.
The reaction in which \(\Delta H=\Delta U\) is
When the same quantity of heat is absorbed by a system at two different temperatures \(T_1\) and \(T_2\), such that \(T_1>T_2\), change in entropies are \(\Delta S_1\) and \(\Delta S_2\) respectively. Then
The work done when 2 moles of an ideal gas expands rèversibly and isothermally from a volume of \(1 \mathrm{~L}\) to \(10 \mathrm{~L}\) at \(300 \mathrm{~K}\) is (\(R=0.0083 \mathrm{~kJ} \mathrm{~K} \mathrm{~mol}^{-1}\))
A gas at a pressure of \(2 \mathrm{~atm}\) is heated from \(25^{\circ} \mathrm{C}\) to \(323^{\circ} \mathrm{C}\) and simultaneously compressed of \(\frac{2}{3}\)rd of its original value. Then the final pressure is
Lattice enthalpy for \(\mathrm{NaCl}\) is \(+788 \mathrm{~kJ} \mathrm{~mol}^{-1}\) and \(\Delta H_{\text {hyd }}^{\circ}=-784 \mathrm{~kJ} \mathrm{~mol}^{-1}\). Enthalpy of solution of \(\mathrm{NaCl}\) is
Temperature of \(25^{\circ} \mathrm{C}\) in Fahrenheit and Kelvin scale respectively are
From the diagram $(Z)=\frac{V_{\text {real }}}{V_{\text {ideal }}}$

$\Delta_r H$ for the reaction, $C \rightarrow A$ is
Given below are two statements.
Statement-I : Adiabatic work done is positive when work is done on the system and internal energy of the system increases.
Statement - II : No work is done during free expansion of an ideal gas.
In the light of the above statements, choose the correct answer from the options given below.
Which one of the following reactions has $\Delta \mathrm{H}=\Delta \mathrm{U}$ ?
Identify the incorrect statements among the following:
(a) All enthalpies of fusion are positive
(b) The magnitude of enthalpy change does not depend on the strength of the intermolecular interactions in the substance undergoing phase transformations.
(c) When a chemical reaction is reversed, the value of $\Delta \mathrm{rH}^{\circ}$ is reversed in sign.
(d) The change in enthalpy is dependent of path between initial state (reactants) and final state (products)
(e) For most of the ionic compounds, $\Delta_{\text {sol }} \mathrm{H}^{\circ}$ is negative