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.
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?
Answer:
AgNO3 Solution is added to aqueous KI solution, negatively charged sol of AgI is formed this is due to selective adsorption of I- ion from the dispersion medium.
AgI + I- ---> [AgI]I-
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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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