This question was poorly answered by most of the candidates that attempted it.  Low performance was recorded particularly in part (a) where many candidates mistook diffusion for osmosis.

The expected answers are:

(a) Diffusion is the process by which substances mix (intimately) with one another due to the random motion of their molecules.                                  
                       
(b) Applications of electrical conduction through gases include:.
-  In advertising industry/Neon signs
  -  In lighting/fluorescent tubes
  -  Identification of gases
   -  Cathode ray oscilloscope/T.V. tubes