Ferrous and ferric salts can be best distinguished from each other by using the reagent:

F e (S C N)_{3}

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N H_{3} C N O

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K_{4} [F e (C N)_{6}]

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dilute H N O_{3}

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Solution

The correct option is C $K_{4} [F e (C N)_{6}]$
Different colours of complex formed on reaction of $[K_{4} F e (C N)_{6}]$ with $F e^{2 +}$ and $F e^{3 +}$ .
Hence, option C is correct.

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K_{4} [F e (C N)_{6}]

K_{4} [{F e (C N)}_{6}]

Give a chemical test to distinguish between the following :

(a) Ammonium chloride and sodium chloride,

(b) Ferric salt and ferrous salt,

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