In which of the following reactions heterogeneous catalysis is involved ? 

$\left(i\right) 2S{O}_2\left(g\right)+O_2\left(g\right)\stackrel{NO\left(g\right)}{\to }2S{O}_3\left(g\right)$

$\left(ii\right) 2S{O}_2\left(g\right)\stackrel{Pt\left(s\right)}{\to }2S{O}_3\left(g\right)$
$\left(iii\right) N_2\left(g\right)+ 3 H_2\left(g\right) \stackrel{Fe\left(s\right)}{\to }2N{H}_2\left(g\right)$
$\left(iv\right) C{H}_{3}COOC{H}_3\left(l\right)+H_{2}O\left(l\right)\stackrel{CH\left(l\right)}{\to }$
$C{H}_{3}COOCH\left(aq\right)+C{H}_{3}OH\left(aq\right)$

1.  (ii), (iii)

2.  (ii), (iii) and (iv)

3.  (i), (ii) and (iii)

4.  (iv)

At high concentration of soap in water, soap behaves as .......

1. Molecular colloid.

2. Associated colloid.

3. Macromolecular colloid.

4.  Lyophilic colloid.

Tyndall effect is shown by 

Method by which lyophobic sol can be protected.

1.  By addition of oppositely charged sol.

2.  By addition of an electrolyte.

3.  By addition of lyophilic sol.

4.  By boiling.

Freshly prepared precipitate sometimes gets converted to colloidal solution by ......

1.  Coagulation

2.  Electrolysis

3.  Diffusion

4.  Peptisation

The electrolytes with maximum coagulating value for Ag/Ag⁺ sol is: 

1.  Na₂S

2.  Na₃PO₄

3.  Na₂SO₄

4.  NaCl

Which of the following phenomenon occurs when a chalk stick is dipped in ink?

a. Adsorption of coloured substance

b. Adsorption of solvent

c. Absorption and adsorption both of solvent

d. Absorption of solvent

The correct choice among the given is -

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Match the types of colloidal systems given in Column I with the names given in Column II.

Codes

Select the correct option based on statements below:

Select the correct option based on statements below: