Preparation of Lyophilic and Lyophobic Sols NEET Questions

Organic Chemistry - Principles of Practical Chemistry

Preparation of Lyophilic and Lyophobic Sols MCQ Questions


13.
In Bredig’s arc method, which of the following takes place?
A.
Condensation
B.
Precipitation
C.
Evaporation followed by condensation
D.
Dispersion by heat
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ANSWER :
C. Evaporation followed by condensation
14.
Colloidal solution of ferric hydroxide can be prepared by
A.
Hydrolysis of ferric chloride
B.
Dissolution of iron in water
C.
Mixing Fe and OH⁻
D.
Dialysis
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ANSWER :
A. Hydrolysis of ferric chloride
15.
Which sol is formed by direct dissolution in water?
A.
Starch sol
B.
Soap sol
C.
Proteins sol
D.
All of these
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ANSWER :
D. All of these
16.
Lyophobic sols are prepared by
A.
Peptization only
B.
Dispersion only
C.
Condensation and dispersion
D.
Oxidation
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ANSWER :
C. Condensation and dispersion
17.
Which method is not applicable for preparation of lyophilic sols?
A.
Peptization
B.
Mixing
C.
Condensation
D.
Dispersion
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ANSWER :
D. Dispersion
18.
In dispersion method, size reduction occurs by
A.
Heating
B.
Boiling
C.
Grinding
D.
Freezing
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ANSWER :
C. Grinding