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Surface Chemistry

Short Answer Type

71. Write one example of each category in which sols particles carry – ve and + ve charges.

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72. Give one example each of W / O and O / W emulsion.

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73. Which names are given if sols have dispersion medium of (a) H₂O, (b) alcohol, (c) benzene?

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74. Write the order of effectiveness of the equimolar solutions of following electrolytes for coagulating a negatively charged sol.
FeCl₃, NaCl, BaCI₂, Th(NO₃)₄.

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75. Why are lyophilic sols self-stabilized?

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76. A sol is prepared by addition of excess of AgNO₃ solution in KI solution. What charge is likely to develop on the colloidal particles?

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77. How can a colloidal solution and true solution of the same colour be distinguished from each other?

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78. Write the reaction in which bismuth molybdate is used as a catalyst.

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79. What is the difference in the nature of a dilute soap solution and a concentrated soap solution?

Answer:

Dilute soap solution behaves like a true solution whereas concentrated soap solution behaves like a colloidal solution.

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80. Give an example of (i) micelles system (ii) macromolecular colloid.

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