Preparation of Lyophilic and Lyophobic Sols NEET Questions

Organic Chemistry - Principles of Practical Chemistry

Preparation of Lyophilic and Lyophobic Sols MCQ Questions


13.
Surface tension of a lyophilic sol is:
A.
Lower than that of the dispersion medium
B.
Equal to that of the dispersion medium
C.
Higher than that of the dispersion medium
D.
Zero
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ANSWER :
A. Lower than that of the dispersion medium
14.
Surface tension of a lyophobic sol is:
A.
Always zero
B.
Almost the same as that of the dispersion medium
C.
Always twice the medium's value
D.
Much lower than that of the dispersion medium
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ANSWER :
B. Almost the same as that of the dispersion medium
15.
Lyophilic sols can be prepared by:
A.
They cannot be prepared in laboratory
B.
Chemical methods like double decomposition only
C.
Simply mixing/warming the substance with the dispersion medium
D.
Bredig's arc method only
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ANSWER :
C. Simply mixing/warming the substance with the dispersion medium
16.
Lyophobic sols are usually prepared by:
A.
Heating the medium
B.
Filtration through ordinary filter paper
C.
Direct mixing with water
D.
Special methods like Bredig's arc, peptization, double decomposition, oxidation, reduction, hydrolysis
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ANSWER :
D. Special methods like Bredig's arc, peptization, double decomposition, oxidation, reduction, hydrolysis
17.
Which of the following methods is a CONDENSATION method of preparing a sol?
A.
Bredig's arc method
B.
Hydrolysis (e.g., FeCl3 + H2O → Fe(OH)3 sol)
C.
Peptization
D.
Mechanical dispersion
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ANSWER :
B. Hydrolysis (e.g., FeCl3 + H2O → Fe(OH)3 sol)
18.
Which of the following is a DISPERSION method of preparing a sol?
A.
Hydrolysis of FeCl3
B.
Oxidation of H2S
C.
Bredig's arc method (for metals like Au, Ag, Pt)
D.
H2S into As2O3
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ANSWER :
C. Bredig's arc method (for metals like Au, Ag, Pt)