Analytical ChemistryHard

Question

Ferric  alum gives deep red colour with NH4SCN due to the formation of :

Options

A.Al(SCN)3
B.[Fe(SCN)3]-
C.Fe(SCN)3
D.None of these.

Solution

Ferric alum contains Fe3+ ions ; Fe3+ + 3SCN- → Fe(SCN)3 (deep red colouration).

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