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Question

The best coagulant for the precipitation of Fe(OH)3 sol is

A
CaHPO3
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B
NaNO3
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C
AlPO4
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D
MgSO4
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Solution

The correct option is C AlPO4
It is important to realise that this is a postively charged sol.
PO34 is the most effective for Fe(OH)3 as it has the highest negative charge.

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