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One mole of a monoatomic real gas satis...

One mole of a monoatomic real gas satisfies the equation `p(V-b)=RT` where `b` is a constant. The relationship of interatomic potential `V(r)` and interatomic distance `r` for gas is given by

A

B

C

D

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The correct Answer is:
A
When the atoms (e.g. H atoms) are very close to each other, there are repulsions and the potential energy of the system is high. When they come closer, attraction takes place,potential energy decreases till at a particular distance (called bond length), the potential energy is lowest (being negative, corresponding to minimum in the curve). Here, forces of attraction and repulsion balance each other. On further increasing the interatomic distance, the interatomic attractions decrease, therefore, potential energy begins to increase and at very large distances, there are no forces of attraction or repulasion and potential energy increases to zero.
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