Question

Ferric alum gives red color with $$NH_4SCN$$ due to formation of:

A
Al(SCN)3
B
FeSO4
C
Fe(SCN)3
D
Fe(SCN)2

Solution

The correct option is B $$Fe{(SCN)}_3$$Ferric atom has $$Fe^{3+}$$ ion which on reaction with $$NH_4SCN$$ gives red color due to formation of the $$Fe(SCN)_3$$ . When in contact with $$Fe^{3+}$$ ion solution in ferric alum solution the product of the reaction is a solution with a blood red colour, due to the formation of the thiocyanato iron complex $$Fe(SCN)_3$$.Chemistry

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