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NH4SCN can be...

Question

$N H_{4} S C N$ can be used to test one or more out of $F e^{3 +}$ , $C o^{2 +}$ , $C u^{2 +}$

F e^{3 +}

only

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C o^{2 +}

C u^{2 +}

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F e^{3 +}

C u^{2 +}

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all of these

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Solution

The correct option is C all of these
Reactions:
$C o^{2 +} (a q) + 4 S C N^{-} (a q) \to C o (S C N)_{4}^{2 -} (a q)$ ppt.

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