(i) Give reason.
(a) Plasma is found in the stars.
(b) The molecules of a solid have the strongest intermolecular forces.
(ii) Out of four gases Cl2, CO2, CH4, N2, which gas would diffuse most rapidly and why?
i. (a) Plasma is found in the stars because of very high temperature. The plasma state consists of highly super excited and energetic particles. The sun and the stars glow mainly because of the presence of plasma in them.
(b) The force of attraction between the constituent particles of solid is strongest. The particles are closely arranged and tightly packed. Hence they have strongest intermolecular forces.
(ii) CH4 gas would diffuse most rapidly because mass of CH4 is least among all the given gases. Diffusion is inversely proportional to the mass of the gas. Lesser is the mass, higher will be diffusion which means lighter gases diffuse faster. Hence, CH4 being a lighter gas would diffuse faster.