Which of the following is an example for heterogeneous catalysis reaction ?

• $2{\mathrm{SO}}_2\left(\mathrm{g}\right) + {\mathrm{O}}_2\left(\mathrm{g}\right) \stackrel{\mathrm{NO}\left(\mathrm{g}\right) }{\to }2{\mathrm{SO}}_3 \left(\mathrm{g}\right)$

• Hydrolysis of aqueous sucrose solution in the presence of aqueous mineral acid

• $2{\mathrm{H}}_2{\mathrm{O}}_2 \left(\mathrm{l}\right) \stackrel{\mathrm{Pt}\left(\mathrm{s}\right) }{\to }2{\mathrm{H}}_2\mathrm{O} \left(\mathrm{l}\right) + {\mathrm{O}}_2 \left(\mathrm{g}\right)$

• Hydrolysis of liquid in the presence of aqueous mineral acid

The disperse phase, dispersion medium and nature of colloidal solution (lyophilic or lyophobic) of 'gold sol' respectively are :

• solid, solid, lyophobic

• liquid, liquid, lyophobic

• solid, liquid, lyophobic

• solid, liquid, lyophilic

Assertion (A) : A catalyst increases the rate of a reaction.

Reason (R) : In presence of a catalyst, the activation energy of the reaction increases.

The correct answer is

• Both (A) and (R) are true and (R) is the correct explanation of (A).

• Both (A) and (R) are true but (R) is not the correct explanation of (A).

• (A) is true, but (R) is not true

• (A) is not true, but (R) is true

Which one of the following graphs represents Freundlich adsorption isotherm ?

Which of the following is not correct?

• Milk is a naturally occurring emulsion

• Gold sol is a lyophilic sol

• Physical adsorption decreases with rise in temperature

• Chemical adsorption is unilayered

Which one of the following gives a straight line for Freundlich adsorption isotherm?

• log $\frac{\mathrm{x}}{\mathrm{m}}$ vs log p

• $\frac{\mathrm{x}}{\mathrm{m}} \mathrm{vs} \frac{1}{\mathrm{p}}$

• log $\frac{\mathrm{x}}{\mathrm{m}} \mathrm{vs} \log \frac{1}{\mathrm{p}}$

• $\frac{\mathrm{x}}{\mathrm{m}} \mathrm{vsp}$

Match the following:

List - I	List - II
A. Solid dispersed in liquid	i. Emulsion
B. Liquid dispersed in liquid	ii. Foam
C. Gas dispersed in liquid	iii. Gel
D. Liquid dispersed in solid	iv. Sol v. Aerosol

The correct match is

• A - iv; B - i; C - ii; D - iii

• A - iii; B - i; C - v; D - ii

• A - iii; B - i; C - ii; D - iv

• A - iv; B - i; C - v; D - iii

58.

Gelly is a colloidal solution of

• solid in liquid

• liquid in solid

• liquid in liquid

• solid in solid

Which of the following is the most effective in causing coagulation of ferric hydroxide solution?

• KCl

• KNO₃

• K₂SO₄

• K₃[Fe(CN)₆]

Which of the following statements is not correct inrespect of chemisorption?

• Highly specific adsorption

• Irreversible adsorption

• Multilayered adsorption

• High enthalpy of adsorption