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:

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