MCQs of Surface Chemistry

Showing 161 to 170 out of 203 Questions

161.

Butter is an example of ______ .

162.

Which of the following electrolytes is most effective in coagulation of gold sol ?

163.

Colours of gold sol prepared by different methods are different. The main reason is _____ .

(a)	impurities present in them
(b)	difference in the size of colloidal particles
(c)	different valences in Au
(d)	different effects of sunlight on it

164.

What is the unit of coagulation value ( or precipitation value) ?

165.

The point at which the stability of colloids becomes minimum and its coagulation occurs is called _____ .

166.

What is the charge on blood colloids ?

167.

In which of the following reactions, the reaction and its enzyme are not suitable ?

(a)	$Sucrose \overset{Invertase}{\to} Glucose + Fructose$
(b)	$Glucose \overset{Zymase}{\to} Ethanol + {CO}_{2}$
(c)	$Urea \overset{Urease}{\to} Ammonia + {CO}_{2}$
(d)	$Sucrose \overset{Sucrolase}{\to} Lactose + Maltose$

168.

What is the fundamental principle of Cottrell smoke precipitator ?

(a)	Neutralization of charge on colloidal particles.
(b)	Deposition of colloid particles on the surface of electrode.
(c)	Peptization of colloid particels in the surface of electrode.
(d)	Separation of dispersed phase and dispersion medium.

169.

The greater adsorption capacity of colloidal particles due to _____ .

(a)	electric charge on their particles
(b)	more surface area
(c)	zigzag motion of colloidal particles
(d)	strong attraction of particles of dispersion medium towards colloidal particles

170.

Silica gel, charcoal are very good adsorbents because _____ .

(a)	they have porous nature
(b)	they have very low attraction for gases
(c)	their specific heat is very low
(d)	they have high capacity to form multimolecular layers

Showing 161 to 170 out of 203 Questions