A crystalline solid X reacts with dil. HCl to liberate a gas Y. Y decolourises acidified KMnO₄. When a gas 'Z' is slowly passed into an aqueous solution of Y, colloidal sulphur is obtained X and Z could be respectively

• Na₂S, SO₃

• Na₂SO₄, H₂S

• Na₂SO₃, H₂S

• Na₂SO₄, SO₂

Gold sol is not

• a macromolecular colloid

• a lyophobic colloid

• a multimolecular colloid

• negatively charged colloid

For Freundlich isotherm a graph of log x/m is plotted against log p. The slope of the line and its y-axis intercept, respectively corresponds to

• $\frac{\mathit{1}}{n} ,\mathit{ }k$

• $\log \frac{1}{n} , k$

• $\frac{1}{n} , \log k$

• $\log \frac{1}{\mathrm{n}}, \log \mathrm{k}$

The electrolyte having maximum flocculation value for AgI/Ag⁺ sol is

• NaCl

• Na₂S

• Na₂SO₄

• Na₃PO₄

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

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