Aqueous Fe(III) ion develops intense red colour with SCN^- while Fe(II) does not. It is due to

JEE Advanced Chemistry question

Aqueous ion develops intense red colour with while does not. It is due to

(A) ion forms a charge-transfer complex with ionsCorrect
(B) is reduced to which is deep red in colour
(C) ion oxidizes to ion that forms red complex with ion
(D) ion does not form any complex with ion

Answer: (A)

Solution

reacts with thiocyanate to form the deep blood-red complex (and related species). The intense colour arises from a ligand-to-metal charge-transfer (LMCT) transition, in which an electron is transferred from the thiocyanate ligand to the metal centre upon absorption of visible light — a far

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Question ID VK-160072