Statement 1 : The dissociation of ${PCl}_{5}$ decreases on increasing pressure.
Statement 2 : An increase in pressure favours the forward reaction.

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Both statement 1 and statement 2 are true and statement 2 is the correct explanation of statement 1.

Statement 1 is false but statement 2 is true.

Both statement 1 and statement 2 are true and statement 2 is not the correct explanation of statement 1.

Statement 1 is true, but statement 2 is false.

answer is C.

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Detailed Solution

${PCl}_{5} ⇌ {PCl}_{5} + {Cl}_{2}$

1 0 0

$1 - α$ $α$ $α$

$K_{P} = [\frac{α^{2}}{1 - α}] . {[\frac{P}{1 + α}]}^{1}$

An increase in pressure will decrease $α$ , to have $K_{P}$ constant. Thus, backward reaction occurs.

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