Q.

When an excess electrolyte is added to a colloidal sol it

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a

Gets coagulated

b

Is ionised

c

Becomes stable

d

Gets purified

answer is A.

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Detailed Solution

Colloids are charged. charge of  colloid can be destroyed by adding excess electrolyte. the oppositely charged ion of the electolyte (floculating ion) neutralizes the charge of colloid. Coagulation of colloid occur.
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