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Surface Chemistry

Short Answer Type

141. Explain the chemical phenomenon involved in the purification of water using potash alum.

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142. Justify the use of gelatin as a protective colloid.

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143. Some zeolites are used to separate long straight chain hydrocarbons from branched chain hydrocarbons in petrochemical industry. Explain how this separation becomes possible.

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144. How is a colloidal solution purified by ultrafiltration?

Answer:

Ultrafiltration is the process of separating solute impurities of different sizes. It is done by treating a filter paper with collodion that reduces the pore sizes and hence permits the electrolyte solution to pass through but retains the colloidal particles.

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145. Consider the adsorption isotherm given below and interpret the variation in the extent of adsorption (x/m) when:

(i) temperature increases at constant pressure.
(ii) pressure increases at constant temperature.

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146. What is the coagulating power of an electrolyte? What is the cause of coagulation?

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147. What are the different steps involved in a heterogeneously catalysed reaction?

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Long Answer Type

148. What are Brownian movement?

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149. Explain the purification of colloidal solutions by dialysis and ultrafiltration.

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150. Give applications of colloids in detail.

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