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Coordination Complexes

Ferric alum g...

Question

Ferric alum gives red colour with ${N H}_{4} S C N$ due to formation of:

A

{A l (S C N)}_{3}

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B

[{F e ({S C N)}_{3}]}^{-}

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C

{F e (S C N)}_{3}

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D

[{F e (S C N)]}^{2 +}

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Solution

The correct option is B ${F e (S C N)}_{3}$
Ferric alum gives red colour with ${N H}_{4} S C N$ due to formation of $[{F e (S C N)]}_{3}$ . Ferric alum is ammonium iron(III) sulfate. Fe(III) ion reacts with ${N H}_{4} S C N$ to give deep red colour of ferric thiocyanate.

$F e^{3 +} + {N H}_{4} S C N \to F e (C N S)_{3} + 3 {N H}_{4}^{+}$

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