Question

The equilibrium constant for a reaction $A+B\leftrightharpoons C+D$ is $1\times {10}^{-2}$ at 298K and is 2 at 273 K. The chemical process resulting in the formation of C and D is:

• A. Exothermic
• B. Endothermic
• C. Unpredictable
• D. There is no relationship $\Delta H$ and K.

Answer 1

The correct option is A Exothermic

With increase in temperature from 273 K to 298 K, the value of the equilibrium constant decreases from 2 to $1\times {10}^{-2}$. Thus as the temperature increases, the equilibrium shifts to left. This is possible for an exothermic reaction.
Thus the process resulting in the formation of C and D is an exothermic reaction.