Question

Give a reason for the following :

(i) Rough surface of catalyst is more effective than smooth surface.

(ii) Smoke is passed through charged plates before allowing it to come out of chimneys in factories.

(iii) Ne gets easily adsorbed over charcoal than He.

Answer 1

(i) Rough surface of a catalyst provides more surface area for adsorption.

(ii) So that unburnt charged carbon particles get settled between the charged plate leaving behind air free from pollutants.

(iii) Ne has higher critical temperature i.e., stronger van der Waals forces therefore gets easily adsorbed.