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Which one of the following acts as the b...

Which one of the following acts as the best coagulating agent for ferric hydroxide sol?

A

Magnesium chloride

B

Potassium ferrocyanide

C

Aluminium chloride

D

Potassium ferricyanide

Text Solution

Verified by Experts

The ions carrying charge opposite to that of sol particles are effective in causing the coagulation of the sol (Hardy-Schulz rule). Ferric hydroxide, `Fe(OH)_(3)` , is a positively charged sol. Thus, the flocculatingpower is in the order:
`[Fe(CN)_(6)]^(4-)gt[Fe(CN)_(6)]^(3-)gt(C_(2)O_(4))^(2-)gtCI^(-)`
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