Q.

Excess KI solution reacts with AgNO3 solution. The sol formed is most effectively coagulated by

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a

BaCl2

b

K4FeCN6

c

Al2SO43

d

Na3PO4

answer is A.

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Detailed Solution

The precipitate formed is AgI;

AgI is surrounded by excess KI

AgI adsorbs the common ion, I- from KI;

A negative sol AgI/I- is formed;

Coagulation power of cation to coagulate a negative sol is

Al+3>Ba+2>M+;

 

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