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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?

Answer:

Selectivity is the ability of the catalyst to direct a reaction to yield a particular product.

for example by using different catalyst we can get different product for the reaction between hydrogen and carbon monoxide.

CO (g) + 3 H_{2} (g) \overset{Ni}{\to} {CH}_{4} (g) + H_{2} O (g) CO (g) + 3 H_{2} (g) \overset{CuZno - {CrO}_{3}}{\to} {CH}_{3} OH CO (g) + 3 H_{2} (g) \overset{Cu}{\to} HCHO (g)

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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.

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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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