Question

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

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

Answer 1

Answer: (A), (B)

The correct options are
A With increase in temperature, the value of K for endothermic reaction increases because unfavourable change in entropy of the surroundings decreases
B With increase in temperature, the value of K for exothermic reaction decreases because favourable change in entropy of the surroundings decreases

$△S_{surr}=\frac{-△H}{T_{surr}}$
For endothermic, if $T_{surr.}$ increases, $△S_{surr}$ will increases.
For exothermic, if $T_{surr.}$ increases, $△S_{surr}$ will dicreases.