For the gas phase reaction,
`PCI_(5(g)) hArr PCI_(3(g)) + CI_(2(g))`
Which of the following conditions are correct ?

Options

A. `Delta H = 0 and Delta S lt 0`
B. `Delta H gt 0 and Delta S gt 0`
C. `Delta h lt 0 and Delta S lt 0`
D. `Delta H gt 0 and Delta S lt`

Answer

B

Explanation

For the reaction, `PCI_(5(g)) hArr PCI_(3(g)) + CI_(2(g))`
The reaction given is an example of decomposition reaction and we know that decomposition reaction are endothermic in nature, i.e. `Delta H gt0`.
Further, `Delta n = (1+1)-1=+1`
Hence, more number of molecules are present in products which shows more randomness i.e. `Delta S gt 0 (Delta S` is positive `)`