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

T0 = TA = p0V0/nR, TB = 5T0, TC = 4T0So for BC, ΔUBC = nCV(TC-TB)ΔUBC = n 3R/2 (4T0-5T0)Also

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