$K_{4} [F e {(C N)}_{6}]$ is used on detecting

{F e}^{3 +}

ion

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{C u}^{+}

ion

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{C u}^{3 +}

ion

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{F e}^{2 +}

ion

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Solution

The correct option is B ${F e}^{3 +}$ ion
${F e}^{3 +}$ ion can be detected by $K_{4} [F e {(C N)}_{6}]$
$4 {F e}^{3 +} + 3 K_{4} [F e {(C N)}_{6}] ⟶ {F e}_{4} {[F e {(C N)}_{6}]}_{3} + 12 K^{+}$
Ferric ferrocyanide ( ${F e}_{4} {[F e {(C N)}_{6}]}_{3}$ ) has Prussian's blue colour.

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When ${F e}^{2 +}$ ion changes to ${F e}^{3 +}$ ion we are witnessing ___

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