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Question

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


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