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For the gas phase reaction, PCl(5)(g)r...

For the gas phase reaction,
`PCl_(5)(g)rarrPCl_(3)(g)+CL_(2)(g)`
Which of the following conditions are correct?

A

`DeltaH lt 0` and `DeltaS lt 0`

B

`DeltaH gt 0` and `DeltaH lt 0`

C

`DeltaH =0` and `DeltaS lt 0`

D

`DeltaH gt 0` and `DeltaS gt 0`

Text Solution

Verified by Experts

The correct Answer is:
D
`PCl_(5)(g) + PCl_(3)(g) - Cl_(2)(g) rArr DeltaG=0`
`0=DeltaH - TDeltaS`
Since gaseous moles are increasing `DeltaS gt 0`
Thus, `DeltaH = T DeltaS rArr DeltaH gt 0`
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