In which of the following reactions,standard reaction entropy change`(DeltaS^(@))`is positive and standard Gibb,s energy change`(DeltaG^(@))`decreases sharply with increasing temperature?

Options

A. `Mg(s)+(1)/(2)O_(2)(g)to MgO(s)`
B. `(1)/(2)C " graphite " +(1)/(2)O_(2)(g)to (1)/(2)CO_(2)(g)`
C. `C " graphite " +(1)/(2)O_(2)(g)to CO(g)`
D. `CO(g)+(1)/(2)O_(2)(g)to CO_(2)(g)`

Answer

C

Explanation

`Delta S = + ve`
`DeltaG=DeltaH-T DeltaS, Delta H= -ve`
`Delta G= +ve`