The potential energy U between the two molecules as a function of the distance X between them is shown in figure. A,B and C are points for which X = 0.6A°, 1.2 A° and 1.8A0. At A, B,and C force between the two molecules respectively

# The potential energy U between the two molecules as a function of the distance X between them is shown in figure. A,B and C are points for which X = 0.6A°, 1.2 A° and 1.8A0. At A, B,and C force between the two molecules respectively

1. A

Zero, attractive, repulsive

2. B

attractive, zero, repulsive

3. C

zero, repulsive, attractive.

4. D

repulsive, zero, attractive.

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### Solution:

From the figure,

$F=-\left(\frac{dU}{dx}\right)$

The slope of the graph is positive in the region BC.

F=negative, which means that force nature is attractive.

The graph's slope is negative in region AB.

F is positive, meaning that it has a repulsive force.

Hence the correct answer is repulsive, zero, and attractive.

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