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Surface Chemistry

Short Answer Type

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

Answer:

Lyophilic sols are relatively stable as strong forces of interaction exist between colloidal particles and liquid.

lyophobic sols are less stable as weak forces of interaction exist between colloidal particles and liquid.

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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.

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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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