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Question

Which one of the following electrolytes is most effective for the coagulation of Fe(OH)3 sol?

A
NaCl
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B
Na2SO4
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C
Na3PO4
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D
As2S3
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Solution

The correct option is D Na3PO4
Fe(OH)3 is a positively charged sol. According to Hardy-Schulze rule, greater the charge on an oppositely charged ion of the electrolyte added, more effectively it is in bringing about the coagulation.

Hence, Na3PO4 (containing PO34 ions) is more effective.

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