Question

When we cool a gas below its condensation point, the K.E. of its molecules:

• A. increases
• B. decreases
• C. remains the same
• D. first decreases then increases

Answer 1

The correct option is B decreases

As we know kinetic energy of molecules of a gas is a function of Temperature

So, As we decrease its temperature or say cool it, its kinetic energy gradually decrease. At a certain point which decreasing kinetic energy it starts bonding up whit molecules and thus condensation starts.

Hence, the answer is decreases.