Milk is an emulsion in which

• a gas is dispersed in water

• lactose is dispersed in water

• milk fat is dispersed in water

• a solid is dispersed in water

Micelles are

• adsorbed catalyst

• ideal solution

• gel

• associated colloids

Which of the following statements is correct for Tyndall effect?

• Scattering and polarising of light by small suspended particles is called Tyndall effect

• Tyndall effect of colloidial particles is due to dispersion of light

• Tyndall effect is due to refraction of light

• Tyndall effect is zig-zag motion of suspended particles.

A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as

• solid sol

• gel

• emulsion

• sol

Which of the following is a lyophobic colloid?

• sulphur

• starch

• gum arabica

• gelatin

Which of the following is true for spontaneous adsorption of H₂ gas without dissociation on solid surface.

• Process is exothermic and ΔS <0.

• Process is exothermic and ΔS >0

• Process is endothermic and ΔS <0.

• Process is endothermic and ΔS >0.

Which one of the following is used in the hardening of leather?

• Light sensitive silver bromide in gelatin

• Sodium lauryl sulphate

• Alum

• Tannin

Which are of the following is a false statement?

• Cell fluid is an example of sol

• Butter is an example of gel

• Hair cream is an example of emulsion

• Cheese is an example of foam

Which one of the following is an emulsion?

• Milk

• Soap lather

• Butter

• Vanishing cream

At Critical Micell Concentration (CMC), the surfactant molecules

• dissociate

• associate

• become completely soluble

• decompose