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Question

An aqueous solution of a salt X turns blood red on treatment with SCN− and blue on treatment with K4[Fe(CN)6]. X also gives a positive chromyl chloride test. The salt X is :

Options

A.CuCl2
B.Cu(NO3)2
C.FeCl3
D.Fe(NO3)3

Solution

FeCl3 gives chromyl chloride test,
Fe3+ + SCN- → blood red color.
and    Fe3+ + K4[Fe(CN)6]  →  Fe4[Fe(CN)6]3
                                               (blue)

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