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

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.

405.

Adsorption of a gas follows Freundlich adsorption isotherm. x is the mass of the gas adsorbed on mass m of the adsorbent. The plot of log $\frac{x}{m}$ versus log p is shown in the given graph. $\frac{x}{m}$ is proportional to :

• p^3/2

• P³

• P²

• P^2/3

A gas undergoes physical adsorption on a surface and follows the given freundlich adsorption isotherm equation $\frac{\mathrm{x}}{\mathrm{m}}= {\mathrm{kp}}^{0.5}$. Adosrption of the gas increases with:

• increase in P and decrease in T

• Decrease in P and decrease in T

• Increase in P and Increase in T

• Decrease in P and Increase in T

Match the catalysts (colum I) with products (column II).

Catalyst - Column I	Products - Column II
A. V2O5	(i) Polyethylene
B. TiCl4/ Al(Me)3	(ii) Ethanal
C. PdCl2	(iii) H2SO4
D. Iron oxide	(iv) NH3

• A - iii; B - i; C - ii; D - iv

• A - ii; B - iii; C - i; D - iv

• A - iv; B - iii; C - ii; D - i

• A - iii; B - iv; C - i; D - ii

The aerosol is a kind of colloid in which:

• Solid is dispersed in gas

• liquid is dispersed in water

• gas is dispersed in liquid

• gas is dispersed in solid

The correct option among the following is :

• Colloidal particles in lyophobic sols can be precipitated by electrophoresis.

• Brownian motion in colloidal solution is faster if the viscosity of the solutions is very high.

• Addition of alum water makes it unfit for drinking.

• Colloidal medicines are more Effective because they have small surface area

Fog is a colloidal solution of 

• Gas in liquid

• Solid in gas

• Gas in gas

• Gas in gas