34
MCQ (Multiple Correct Answer)
What happens when a Lyophilic sol is added to a Lyophobic sol?
A
Lyophobic sol is protected
B
Lyophilic sol is protected
C
Film of lyophilic sol is formed over lyophobic sol
D
Film of Iyophobic sol is formed over Iyophilic sol
35
MCQ (Multiple Correct Answer)
Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented?
A
Reverse osmosis takes place
B
Electroosmosis takes place
C
Dispersion medium begins to move
D
Dispersion medium becomes stationary
36
MCQ (Multiple Correct Answer)
In a reaction, catalyst changes ............ .
A
physically
B
qualitatively
C
chemically
D
quantitatively
37
MCQ (Multiple Correct Answer)
Which of the following phenomenon occurs when a chalk stick is dipped in ink?
A
Adsorption of coloured substance
B
Adsorption of solvent
C
Absorption and adsorption both of solvent
D
Absorption of solvent
38
Subjective
Why is it important to have clean surface in surface studies?
Explanation
It facilitates the adsorption of desired species. If surface is covered by the gases of air then it will not be available for adsorption of desired gases. So, it is very important to have clean surface in surface studies i.e., study of surface chemistry.