Surface chemistry

Extent of adsorption of adsorbate from solution phase increases with……

• increase in amount of adsorbate in solution

• decrease in surface area of adsorbent

• increase in temperature of solution

• decrease in amount of adsorbate in solution

In Freundlich adsorption isotherm x/m = Kp1/n, the value of ‘n’ at low pressure is

• more than one.

• less than one.

• equal to one.

• from zero to one.

According to adsorption theory of catalysis, the speed of the reaction increases because

• The concentration of the reactant molecules at the active centres of the catalyst becomes high due to adsorption.

• in the process of adsorption, the activation energy of the molecules becomes large.

• adsorption produces heat which increases the speed of the reaction

• adsorption lowers the activation energy of the reaction.

Which shape selective catalyst is used to convert alcohol to gasoline?

• Trpsin

• Calgon

• ZSM-5

• Zeigler-Natta catalyst

When a small amount of FeCl3 is added to a freshly precipitated Fe(OH)3, b reddish brown colloidal solution is obtained. This phenomenon is known as

• dialysis

• peptization

• protection

• dissolution