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Question

For the gas phase decomposition:
PCl5(g)ΔPCl3(g)+Cl2(g)

A
ΔH<0,ΔS<0
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B
ΔH>0,ΔS>0
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C
ΔH>0,ΔS<0
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D
ΔH<0,ΔS>0
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Solution

The correct option is A ΔH<0,ΔS<0
For a equilibrium reaction, ΔG=0
So ΔH=T×S
As the moles in product side are more so entropy increased and according to the formula H depend upon the S. So, both are increasing.

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