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 DK3PO4 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.