Assertion : For the combustion of methane, `DeltaE gt DeltaH`.
Reason : `DeltaH` is related to `DeltaE` by the expression, `DeltaH = DeltaE + Deltan_(g)RT`

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Answer

A

Explanation

Combustion of methane is
`CH_(4) + 2O_(2) rarr CO_(2) + 2H_(2)O`
The relation between `Delta H and Delta E` is
`Delta H= Delta E+ Delta nRT`
`Delta n= n_(p)- n_(r)=1 -3 = -2`
`Delta H= Delta E- 2T`
So, `Delta H lt Delta E`
Hence, reason is correct explanation of assertion.