Thermodynamics · Chemistry · KCET

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MCQ (Single Correct Answer)

1

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.

KCET 2025
2

Which one of the following reactions has $\Delta \mathrm{H}=\Delta \mathrm{U}$ ?

KCET 2025
3

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

KCET 2025
4

From the diagram $(Z)=\frac{V_{\text {real }}}{V_{\text {ideal }}}$

KCET 2024 Chemistry - Thermodynamics Question 5 English

$\Delta_r H$ for the reaction, $C \rightarrow A$ is

KCET 2024
5

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

KCET 2023
6

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

KCET 2023
7

Temperature of $$25^{\circ} \mathrm{C}$$ in Fahrenheit and Kelvin scale respectively are

KCET 2023
8

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 ($$R=0.0083 \mathrm{~kJ} \mathrm{~K} \mathrm{~mol}^{-1}$$)

KCET 2022
9

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

KCET 2020
10

The reaction in which $$\Delta H=\Delta U$$ is

KCET 2019
11
A reaction has both $\Delta H$ and $\Delta S$ -ve. The rate of reaction
KCET 2017
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