Potassium ferrocyanide is used for the detection of

F e^{3 +}

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F e^{2 +}

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A l^{3 +}

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S O_{4}^{2 -}

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Solution

The correct option is B $F e^{2 +}$
$F e^{2 +}$ reacts with ferrocyanide to produce deep blue coloured precipitate of Prussian blue

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The expression for the solubility product of $A l_{2} (S O_{4})_{3}$ is

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