Question
An ideal gas expands in such a way that $PV^2 =$ constant throughout the process.
✓
Answer
From ideal gas equation, $PV =nRT$
$\Rightarrow \mathrm{VT}=\mathrm{constant}$
$\Rightarrow \mathrm{V}$ is inversely proportional to $\mathrm{T}$
$\Rightarrow$ expansion causes increase in $\mathrm{V}$
$\Rightarrow$ it leads to decrease in $T$
$\Rightarrow$ gas is cooled
So correct option is $d$
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