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Answer; when freshly precipitated Fe(OH) 3 is shaken with little amount of dilute solution of FeCl 3 (electrolyte ) peptization prcess take place by converting the Fe(OH) 3 precipitate into colloidal solution.

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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?

Answer;
when freshly precipitated Fe(OH)₃ is shaken with little amount of dilute solution of FeCl₃ (electrolyte ) peptization prcess take place by converting the Fe(OH)₃ precipitate into colloidal solution.

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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.

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57. Derive the variation of x/m versus temperature for physical adsorption process. Explain the nature of the curve.

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58. What is common in aqua-sols and solid aerosols? Also find the point of distinction between them.

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59. What is electrophoresis due to?

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60. Give one example each of positively charged sol and one example of negatively charged sol:

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Short Answer Type

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

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