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Question

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

A
NaCl
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B
CaCl2
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C
Fe2(SO4)3
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D
K3PO4
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Solution

The correct option is D K3PO4
Aluminium hydroxide forms a positively charged sol.
The ionic substance that should be most effective in coagulating the sol is K3PO4 as it has maximum charge on the anion.

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