Explain how the phenomenon of pdsorption finds application in each of the following processes :
(i) Production of vacuum
(ii) Heterogeneous catalysis
(iii) Froth Floatation process

Explanation

(i) The remaining traces of air can be absorbed by charcoal from a vessel evacuated by a vaccum pump to give a very high vacum.
(ii) Adsorption of reactants on the solid of the catalysts increases the rate of reaction.
(iii) A low grade sulphide ore is concentration by separating it from silica and other earthy matter by this method using pine oil and frothing agent.