Areaction is non-spontaneous at any temperature whendelta h is negative and delta s is positivedelta h is positive and delta s is negativedelta h is negative and delta s is negativedelta h is positive and delta s is positive

Delta H is positive and Delta S is negative

Explanation:

The expression for the standard change in free energy is:

Where,  

is the change in the Gibbs free energy.

T is the absolute temperature. (T in kelvins)

is the enthalpy change of the reaction.

is the change in entropy.

For a reaction to be non-spontaneous,

So,

To be the above equation satisfied, the conditions are:-

and

Thus, answer is:- Delta H is positive and Delta S is negative

what is the question?

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.