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Q.

Aluminium hydroxide forms a positively charged sol. Which of the following ionic substances should be most effective in coagulating the sol?

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a

K3PO4

b

Fe2SO43

c

CaCl2

d

NaCI

answer is D.

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Detailed Solution

AI(OH)3 is positively charged sol. K3PO4 has greater negative charge. Hence, it is most effective in coagulation of Al(OH)3 sol.

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