SURFACE CHEMISTRY

The term ‘sorption’ stands for ____________.

• absorption

• adsorption

• both absorption and adsorption

• desorption

Physical adsorption of a gaseous species may change to chemical adsorption with ______________.

• decrease in temperature

• increase in temperature

• increase in surface area of adsorbent

• decrease in surface area of adsorbent

At high concentration of soap in water, soap behaves as ____________.

• molecular colloid

• associated colloid

• macromolecular colloid

• lyophilic colloid

Adsorption is a................process

• Exothermic process

• Endothermic process

• Both

• None

what are colloids?

• homogeneous system

• heterogenous system

what is brownian movement?

• zigzag movement of colloids

• reflection of colloids

• dispersion of colloids

• adsorption of colloids

Activated adsorption is the other name of

• physisorption

• chemisorption

• sorption

• absorption

Physical adsorption

• increases with increase in temperature

• decreases with increase in temperature

• occurs readily at high temperature

• none

Which forms multi molecular layers during adsorption

• vander waal's adsorption

• physical adsorption

• Freundlich adsorption

• All are correct

An adsorption isotherm is a graph plotted between magnitude of ----------- and -----------------.

• pressure and temperature

• temperature, surface area

• adsorption, pressure

• absorption and adsorption