Can `DeltaU and DeltaS` discriminate between irreversible and reversible process? Explain.

Explanation

Change in internal energy `(triangleU)`
In exothermic process and internal energy lowered (Reaction is Spontaneous)
In case of reversible reaction the reaction favoured in the direction where there is decrease in the internal energy
Change in entropy `"(triangleS) =` positive" is a condition but is not necessary and sufficient condition for the spontancous nature of a reaction.
For a spontaneous process change.in entropy is positive
`triangleS `= +ve (spontaneous)
`triangleS `= -ve (backward reaction is spontaneous)
`triangleS= 0` (Equilibrium reaction)
`triangleH= -ve, triangleS= +ve, triangleG= -ve` then the reaction
Spontaneous at all J values (Reaction is irreversible)