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In a given process for an ideal gas, $d W=0$ and $d Q \lt 0$. Then for the gas
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The temperature will decrease
From FLOT
$\begin{aligned} \Rightarrow d U & =d Q-d W \Rightarrow d U=d Q(\lt 0), (d W=0) \\ \Rightarrow d U & \lt 0 \text { So temperature will decrease }\end{aligned}$
$\begin{aligned} \Rightarrow d U & =d Q-d W \Rightarrow d U=d Q(\lt 0), (d W=0) \\ \Rightarrow d U & \lt 0 \text { So temperature will decrease }\end{aligned}$
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