For a reaction taking place in a container in equilibrium with its surroundings, the effect of temperature on its equilibrium constant Kin terms of change in entropy is described by

Options

A. With increase in temperature, the value of K for endothermic reaction increase because unfavourable change in entropy of the surroundings decreases
B. With increase temperature , the value of K for exothermic reaction decreases because favourable change in entropy of the surroundings decreases.
C. With increase in temperature, the value of K for endothermic reaction increases because the entropy change of the system is positive.
D. With increase in temperature , the value of K for exothermic reaction decreasesbecause the entropy change of the system is positive.

Answer

a,b

Explanation

`DeltaS_("surr") = - (DeltaH)/( T_("surr"))`
For endothermica reaction , if`T_(surr)` increases, `DeltaS _(surr)`will increase `( :'DeltaH = +ve)`
For exothermic reactions K increases with increase of temperature `(K= K_(f) //K_(b))` and in endothermic reaction, `k_(f)` increases with increase of temperature) whereas for exothermic reaction, K decreases with increase of temperature ( because in these reactions, `k_(b)` increases with increase of temperature) .