Colour of compounds occurs due to phenomenon of polarisation, charge transfer, d-d transitionand H.O.M.O.L.U.M.O transition. Most of the transition metal transition metal complex compound are coloured either due to d-d electrons transition or charge transfer and ionic compounds are coloured due to polarisation of anion. Q. Which of the following is correct about KFE^(II)[underset(II)(Fe)(CN_(6))] and KFE^(III)[underset(III)(Fe)(CN_(6))] complex compounds?

Colour of compounds occurs due to phenomenon of polarisation, charge t

1.	Colour of compounds occurs due to phenomenon of polarisation, charge transfer, d-d transitionand H.O.M.O.L.U.M.O transition. Most of the transition metal transition metal complex compound are coloured either due to d-d electrons transition or charge transfer and ionic compounds are coloured due to polarisation of anion. Q. Which of the following is correct about KFE^(II)[underset(II)(Fe)(CN_(6))] and KFE^(III)[underset(III)(Fe)(CN_(6))] complex compounds?
Answer» Both are blue COLOURED compounds because colour arisesdue to d-d ELECTRONS transition in Fe cation present outside the complex ion. Both are blue coloured compounds because colour arisesdue to transfer of electron between `Fe^(II) and FE^(III)` cation Both are blue coloured compounds because in complexes `Fe^(II)` cation shows same d-d transition bond Complex (I) has blue colour becouse (II) has BROWN colour Answer :B