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131. How does an increase in temperature affect both physical as well as chemical adsorption?

In the case of physical adsorption the extent of adsorption (x/m) decrease with increase of temperature, as most of the adsorption processes are exothermic with increase n temperature the kinetic energy of the molecule increase and they try to escape from the surface and hence physical adsorption decrease with increase in temperature.

In case of chemical adsorption as the temperature increase the extent of adsorption (x/m) increase, attains a maximum value and then decrease.
Chemical adsorption takes place as a result of chemical reaction between adsorbate and adsorbent hence with the increase in temperature the adsorption increase untill the total surface is covered with one layer after there is adsorption by increasing temperature.

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132. A colloidal solution of Agl is prepared by two different methods shown below:

(i) What is the charge of AgI colloidal particles in the two test tube (A) and (B).
(ii) Give reason for the origin of change.

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133. Explain why hydrophillic sols are relatively more stable than hydrophobic sols?

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134.

(a) What is gel? Give an example.
(b) How is gold sol prepared by reduction method ?

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Long Answer Type

135. Explain the process of peptization Name only one hydrosol.

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Short Answer Type

136. The adsorption of gases on solids can be described by Frundlich’s reaction:

(\frac{x}{m}) = {kp}^{1 / 4}

(i) How are the values of k and n determined experimentally?
(ii) Explain why the value of n should be equal to or greater than one?

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Long Answer Type

137.

Explain the following observations:
(a) Ferric hydroxide sol gets coagulated on addition of sodium chloride solution.
(b) Cottrell’s smoke precipitator is fitted at the mouth of the chimney used in factories.
(c) Physical adsorption is multi layered, while chemisorption non layered.

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Short Answer Type

138. Differentiate between homogeneous catalysis and heterogeneous catalysis.

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139. How will you prepare silver sol by Bredig’s Arc method?

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140. Why is smoke passed through charged plates before allowing it to come out of chimneys in factories?

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