$K_{4} [{F e (C N)}_{6}]$ can be used to test :

{F e}^{3 +}

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{F e}^{2 +}

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{Z n}^{2 +}

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{C d}^{2 +}

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A, C and D

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Solution

The correct option is A A, C and D
$K_{4} [{F e (C N)}_{6}]$ can be used to test ${F e}^{3 +}$ , ${Z n}^{2 +}$ and ${C d}^{2 +}$
${F e}^{3 +}$ reacts with potassium ferrocyanide to form purssian blue precipitate of ferric ferrocyanide $F e_{4} [F e (C N)_{6}]_{3}$ .
${Z n}^{2 +}$ reacts with potassium ferricyanide to form bluish white precipitate of zinc ferrocyanide $Z n_{2} [F e (C N)_{6}]$

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