Choose the correct statement from the following:
(a) the volume of gas ” expands on heating
(b) two gases cannot diffuse into each other
(c) gas is converted into solid, it is called condensation
(d) gases cannot diffuse in solids

Correct answer: (a) the volume of gas expands on heating

Explanation: Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.