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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.

Answer:

In sol dispersing phase is solid and dispersing medium is liquid.
In gel dispersing phase is liquid and dispersing medium is soild.

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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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