Which of the following curve is in accordance with Freundlich adsorption isotherm?

Which of the following statements is incorrect with respect to physisorption?

• The forces involved are van der Waals' forces

• More easily liquefiable gases are adsorbed easily

• Under high pressure it results into multimolecular layer on adsorbent surface

• $∆$H_adsorption is low and positive

Sulphur sol contains

• discrete S-atoms

• discrete S molecules

• large aggregates of S molecules

• water dispersed in solid sulphur

Which of the following colloids cannot be easily coagulated?

• Lyophobic colloids

• Multimolecular colloids

• Macromolecular colloids

• Irreversible colloids

115.

The pressure of real gases is less than that of ideal gas because of

• increases in the kinetic energy of the molecules

• increases in the number of collisions

• intermolecular attraction

• finite size of particles

An aerosol is a:

• dispersion of a solid or liquid in a gas

• dispersion of a solid in a liquid

• dispersion of a liquid in a liquid

• solid solution

An aqueous solution of potash alum gives :

• two types of ions

• only one type of ion

• four types of ions

• three types of ions

The formation of SO₃ takes place according to the following reaction :

2SO₂ + O₂ $\rightleftharpoons$ 2SO₃; $∆\mathrm{H}$ = -45.2 kcal

The formation of SO₃ is favoured by:

• increase in temperature

• removal of oxygen

• increase of volume

• increase of pressure

The process which is responsible for the formation of delta at a place where rivers meets the sea is

• Coagulation

• Colloid formation

• peptisation

• emulsification

A precipitate is changed to colloidal solution by the following process :

• dialysis

• ultrfiltation

• peptization

• electrophoresis