Cow milk, an example of natural emulsion, is stabilised by

• fat

• water

• casein

• Mg²⁺ ions

172.

Gold number is associated with

• amount of gold

• protective colloids

• purple of cassius

• electrophoresis

Which one of the following forms micelles in aqueous solution above certain concentration?

• Urea

• Dodecyl trimethyl ammonium chloride

• Pyridinium chloride

• Glucose

Migration of colloidal particles towards the oppositely charged electrode is called:

• Electrosmosis

• Electrophoresis

• Coagulation

• Electrodispersion

The variation of adsorption of N, on charcoal with pressure at different constant temperature can be represented by :

The correct increasing order of temperature
T₁ , T₂ and T₃ is :

• T₁ < T₂ < T₃

• T₂ < T₃ < T₁

• T₃ < T₂ < T₁

• T₂ < T₁ < T₃

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

Solvent loving colloids are known as

• hydrophobic

• lyophilic

• hydrophilic

• none of these

Freundlich adsorption isotherm gives a straight line on plotting:

• $\frac{\mathrm{x}}{\mathrm{m}}$ vs p

• log $\frac{\mathrm{x}}{\mathrm{m}}$ vs p

• log $\frac{\mathrm{x}}{\mathrm{m}}$ vs log p

• $\frac{\mathrm{x}}{\mathrm{m}}$ vs $\frac{1}{\mathrm{p}}$

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-

Which one of the following colloidal solution is positive sol?

• Gelatin in strongly acidic solution

• Smoke

• Dlay soil

• Blood