Assertion : If both `Delta H ^(@) and Delta S ^(@)` are positive then reaction will be spontaneous at high temperature.
Reason : All processes with positive entropy change are spontaneous.

Options

A. and (R) are correct and (R) is the correct explanation of(A).
B. If both (A) and (R) are correct, but (R) is not the correct explanation of(A).
C. If(A) is correct, but (R) is incorrect.
D. If both (A) and (R) are incorrect.

Answer

C

Explanation

Spontaneity of a process depends upon `Delta G^(@)`which combines both factors `Delta H^(@) and Delta S^(@).`
`Delta G ^(@) = Delta H ^(@) - T Delta S ^(@)`
For the spontaneity, `Delta G ^(@)` should be negative. If`Delta H ^(@)` is `+ve, Delta S ^(@)` is +ve then, `Delta G ^(@)` to be-ve only when ` T Delta S gt Delta H` which is possible at high temperature.