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Column - I Column - II
A) Reversible cooling of an ideal gas at constant volume P) $w = 0; q < 0; Δ U < 0$
B) Reversible isothermal expansion of an ideal gas Q) $w < 0; q > 0; Δ U > 0$
C) Adiabatic expansion of non-ideal gas Into vacuum R) $w = 0; q = 0; Δ U = 0$
D) Reversible melting of sulphur at normal melting point S) $w < 0; q > 0; Δ U = 0$

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$A \to Q, B \to R, C \to S, D \to P$

$A \to Q, B \to R, C \to P, D \to S$

$A \to P, B \to R, C \to Q, D \to S$

$A \to P, B \to S, C \to R, D \to Q$

answer is B.

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