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Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is:

1. Fe4[Fe(CN)6]3
2. K3[Fe(CN)6]
3. HFe[Fe(CN)6]
4. KFe[Fe(CN)6]

Correct answer: KFe[Fe(CN)6]

Solution

The correct option, KFe[Fe(CN)6], represents potassium ferricyanide, which forms a colloidal complex with ferric ions in acidic conditions, resulting in the characteristic Prussian blue color.

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