These diagrams represent the potential energy `U` of a diatomic molecule as a function of the inter-atomic distance `r`. The diagram corresponds to stable molecule found in nature is.

Options

A.
B.
C.
D.

Answer

A

Explanation

When the distance between atoms is large then interatomic force is very weak. When they come closer, force of attraction increases and at a particular distance force becomes zero.
When they are further brought closer force becomes repulsive in nature.
This can be explained by slope of U-x curve shown in graph (a).