Equal volumes of each of two sols of AgI, one obtained by adding AgNO3 to slight excess of KI and the other obtained by adding KI to slight excess of AgNO3, are mixed together. Then:
A
The two sols will stabilize each other
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B
The sol particle will acquire more electric charge
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C
The sols will coagulate each other mutually
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D
A true solution will be obtained
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Solution
The correct option is C The sols will coagulate each other mutually When AgNO3 is added to excess KI then a negative sol is formed due to adsorption of I− ion from KI onto the AgI precipitate. Oppositely a poisitive sol is obtained when KI is added to AgNO3 because Ag+ ions are adsorbed this time. So the sols will coagulate each other mutually.