Question

Figure shows potential energy v/s position curve for molecules. Which of the following statement cannot be inferred from the figure?

• A. At point A, force acting between molecules = 0
• B. At point B, force between molecules is attractive
• C. At point C, force between molecules is repulsive
• D. At point A, force acting between molecules is attractive

Answer 1

The correct option is D At point A, force acting between molecules is attractive

F = - dU/dr.
Since dU/dr is zero at point A. Hence force acting between molecules at point A is zero.