An ideal monatomic gas is taken from state A to B, then from state B to state C and finally back to state A as shown in the P-V diagram. Which of the following is correct for BC process?

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$ΔQ + ve, ΔU + ve, ΔW - ve$

$ΔQ + ve, ΔU + ve, ΔW + ve$

$ΔQ + ve, ΔU - ve, ΔW + ve$

$ΔQ - ve, ΔU - ve, ΔW - ve$

answer is D.

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Detailed Solution

In process BC volume decreases. So
$ΔW - ve$
$Δ T = \frac{4 p_{0} V_{0} - 5 p_{0} V_{0}}{n R}$ is negative. So $ΔU - ve .$
$Δ Q = Δ U + Δ W$ is negative

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