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Surface Chemistry

Short Answer Type

41. Why is a lyophilic colloid more stable than a lyophobic colloid?

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42. What is an aerosol?

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43. What is a gel? Give one example?

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44. What do you mean by the selectivity of the catalyst?

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45. Deltas are formed where the river and sea water meet. Give reasons.

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46. What is the effect of increase of temperature on the adsorption of a gas on a solid surface?

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47. Write the name of the states of (i) dispersed phase and, (ii) dispersion medium in the case of butter.

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48. Write a mathematical expression showing relationship between the amount of solute adsorbed per unit mass of the solid adsorbent and the concentration of the solute in solution.

Answer:

Freundlich adsorption isotherm: Freundlich gave an
empirical relationship between the quantity of gas adsorbed by unit mass of solid adsorbent and pressure at a particular temperature. The relationship can be expressed by the following equation

\frac{x}{m} = {kP}^{1 / η} .

where x is mass of the gas absorbedon mass m of the absorbent at pressure P
k and n are constant depends on the nature of adsorbent and gas at particular temperature.

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49. What do x and m represent in the following expression:

(\frac{x}{m}) = {kP}^{1 / n} ?

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50. What are emulsifiers?

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