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  4. The potassium ferrocyanide solution gives a Prussian blue colour, when added to:

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Q. The potassium ferrocyanide solution gives a Prussian blue colour, when added to:

JEE MainJEE Main 2021Organic Chemistry – Some Basic Principles and Techniques

Solution:

$FeCl_3 + K_4[Fe(CN)_6] \to \underset{\text{Prussian blue}}{Fe_4[Fe(CN)_6]_3}$