Q.

Consider the following gaseous reversible reactions occuring in a closed vessel. Addition of argon gas at constant pressure favours forward reaction in the case of

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N2g+O2g⇌2NOg

N2g+3H2g⇌2NH3g

2SO2g+O2g⇌2SO3g

PCl5g⇌PCl3g+Cl2g

answer is D.

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Detailed Solution

Addition of inert gas at constant pressure favours reaction involving increase in number of moles; In option (4) . . . nP>nR ∴ forward reaction is favoured KC=PCl3Cl2PCl5;KC=nPCl3.nCl2nPCl5.V;Addition of inert gas increases ‘V’ thus denominator increases.To keep KC constant, numerator must increase.Products can increase only when PCl5 decomposes readily.

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