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Surface Chemistry

Short Answer Type

51. What happens when a freshly precipitated Fe(OH)₃ is shaken with little amount of dilute solution of FeCl₃?

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52. Which will adsorbe more a lump of charcoal or charcoal powder, and why?

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53. Draw a plot of variation in the quantity of the gas absorbed (x/m) with the pressure of the gas?

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54. What is observed when sodium chloride is added to ferric hydroxide sol?

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55. Give one difference between sol and gel.

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56. What are macro-molecular colloids? Give one example.

Answer:

In macro - molecular colloids, the colloidal particles are molecule having colloidal dimension. These particles have ahigh molecular mass, when these particles are dissolved in liquid sol is obtained. example of macro-molecule are starch, protein fiber etc.

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