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CBSE

Subject

Chemistry

NEET Chemistry : Surface Chemistry

Multiple Choice Questions

21.

Gasoline is

C₁₇H₃₆ to C₂₁H₅₀
C₇H₂₄ to C₁₄H₃₄
C₇H₁₆ to C₁₀H₂₂
C₃H₈ to C₆H₁₄

22.

Paints and hair creams are respectively

sol and emulsion
aerosol and foam
emulsion and sol
foam and gel.

23.

A emulsifier is a substance which :

stabilises the emulsion
homogenises the emulsion
coagulates the emulsion
accelerates the dispersion of liquid in liquid

24.

Freundlich adsorption isotherm gives a straight line on plotting:

$\frac{x}{m}$ vs p
log $\frac{x}{m}$ vs p
log $\frac{x}{m}$ vs log p
$\frac{x}{m}$ vs $\frac{1}{p}$

25.

The coagulation of 200 mL of a positive colloid took place when 0.73 g HCl was added to it without changing the volume much. The flocculation value of HCl for the colloid is

100
36.5
0.365
150

26.

Which one of the following colloidal solution is positive sol?

Gelatin in strongly acidic solution
Smoke
Dlay soil
Blood

27.

Which of the following statement is not correct?

Adsorption energy for chemical adsorption is generally greater than that of physical adsorption
Physical adsorption is due to van der Waal forces
Physical adsorption decreases at high temperature and low pressure
Physical adsorption is irreversible

28.

Solvent loving colloids are known as

hydrophobic
lyophilic
hydrophilic
none of these

29.

Extent of adsorption of adsorbate from solution phase increases with :

increase in amount of adsorbate in solution
decrease in surface area of adsorbent
increase irtemperature of solution
decrease in amount of adsorbate in solution

30.

Arsenic sulphide sol is prepared by passing H₂S through arsenic oxide solution. The charge developed on the particles is due to adsorption of :

H⁺
S^2-
OH^-
O^2-

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