A porcess is nonspontaneous at evey temperature if
(i) `Delta H gt 0, Delta S = 0`
(ii)`Delta H lt 0, Delta S gt 0`
(iii) `Delta H gt 0, Delta S lt 0`
(iv) `Delta H = 0, Delta S lt 0`

A reaction is spontaneous at low temperature but non spontaneous at high temperature. Which of the following (1) DeltaH gt 0, DeltaS gt 0 (2) DeltaH lt 0, DeltaS lt 0 (3) DeltaH gt 0, DeltaS = 0 (4) DeltaH lt 0, DeltaS lt 0 (5) DeltaH = 0, DeltaS lt 0

Which condition does not satisfy the spontaneity criteria ofa reaction at constant temperature and pressure (1) Delta H lt 0, DeltaS lt 0 , (2) Delta Hgt0,DeltaS lt 0 (3) DeltaH gt 0,DeltaS gt0 , (4) DeltaH lt0,DeltaS gt0 ?

At the sublimition temperture, for the process CO_2(s) iff CO_2(g) (1) DeltaH, DeltaS and DeltaG are all positive (2) DeltaH gt 0, DeltaS gt 0 and DeltaG lt 0 (3) DeltaH lt 0, DeltaS gt 0 and DeltaG lt 0 (4) DeltaH gt 0, DeltaS gt 0 and DeltaG gt 0 (5) DeltaH gt 0, DeltaS gt 0 and DeltaG = 0

Give an example of a process for each of the given cases: (1) DeltaG=0, DeltaS gt0 (2) DeltaG=0,DeltaS lt 0 (3) DeltaG lt 0, DeltaS gt0 (4) DeltaG lt 0, DeltaS lt 0 in a system.

Comment on the spontaneity of a process when Delta H gt 0, T Delta S lt 0

Comment on the spontaneity of a process when DeltaH gt 0, T Delta Sgt 0 and T DeltaS lt DeltaH

In which of the following cases,the reaction is spontaneous at all temperature [A] Delta H>0,Delta S>0 ; [B] Delta H 0 ; [C] Delta H>0,Delta S<0