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

N a C l

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C a C l_{2}

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F e_{2} (S O_{4})_{3}

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K_{3} P O_{4}

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Solution

The correct option is D $K_{3} P O_{4}$
Aluminium hydroxide forms a positively charged sol.
The ionic substance that should be most effective in coagulating the sol is $K_{3} P O_{4}$ as it has maximum charge on the anion.

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