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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?

Answer:

(a) Hydrosols
(b) Alcosol
(c) Benzosol.

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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?

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

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Short Answer Type

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

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