Q64 / 200 · NEET 2008 (Screening) · Chemistry

If a gas expands at constant temperature, it indicates that

A
kinetic energy of molecules decreases
B
pressure of the gas increases
Correct answer
C
kinetic energy of molecules remains the same
D
number of the molecules of gas increases

Solution

Key Idea : $\begin{gathered} K E=\frac{3}{2} R T \\ \mathrm{KE} \propto \mathrm{T} \end{gathered}$ Here, the temperature of gas remains constant, hence kinetic energy of molecules remains the same.

Hence, the correct answer is option: 'C'.

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