Which of the following is not physical characteristic of gases ?

Options

A. Densities of gases can be increases by applying increased pressure.
B. Pressure must be xerted to confine gases.
C. Different gases in a mixture do not separate on standing .
D. A sample of a gas contains more molecules when hot than it contains when cold at the same pressure.

Answer

D

Explanation

A sample of a gas occupies a greater volume when hot than it does when cold at the same pressure, but the number of molecules does not change.