(A) For reaction `2NH_(3)(g)toN_(2)(g)+3H_(2)(g)," "DeltaHgtDeltaE`
(R) Enthalpy change is always greater than internal energy change.

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

C

Explanation

For reaction, `2NH_(3)(g) rarr N_(2)(g) + 3H_(2)(g)`
`Delta n_(g)= (3+1)- 2= 2`
`Delta H= Delta E + Delta n_(g)RT = Delta E+ 2RT`
`therefore Delta H gt Delta E`
If the value of `Delta n_(g)` is less than one, then `Delta H lt Delta E`.