If the thio-cyanide ion is added to potash-ferric alum then red colour appears. This colour is due to the formation of:

K S C N

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F e (S C N)_{3}

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F e (S C N)_{2}

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F e (S C N)

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Solution

The correct option is C $F e (S C N)_{3}$
The $F e^{3 +}$ ions react with the thiocyanide ion present in the solution to form a dark red colored complex of iron thiocyanate, i.e;
$F e^{3 +} + S C N^{-} + 5 H_{2} O ⟶ [F e (S C N)$ 3 $(H_{2} O)_{5}]^{2 +}$

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