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Q.

The gas phase reaction 2A(g) = A2(g) at 400K has ∆G= + 25.2 kj mol–1. The equilibrium con-stant Kc for this reaction is × 10–2 (Round off to the Nearest Integer) [Use : R = 8.3 J mol–1K–1, In10 = 2.3 log102 = 0.30, 1 atm = 1 bar] [antilog (– 0.3) = 0.501]

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answer is 50.

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Detailed Solution

∆G =RTlnQ  25.2×103= -8.6×400×2.303 log10Keq log10Keq = -3.3 Keq = 50×10-2

Hence, the correct answer is 50

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