Coordination CompoundHard

Question

Among the following the compound that is both paramagtic and coloured is

Options

A.K2Cr2O7
B.(NH4)2[TiCl6]
C.VOSO4
D.K3Cu(CN)4

Solution

(d) In K3 [Cu(CN)4]Cu is + 1 oxidation state hence has no unpaired electron hence colourless and diamagnetic.
(b) In (NH4)2 [TiCl6Ti is in + 4 oxidation state hence has no unpaired electron thus it is colourless and diamagnetic.
(c) In VOSO4 V is in +4 oxidation state hence has no unpaired electron thus it is colourless and diamagnetic.
(a) In K2Cr2O7Cr is in + 6 oxidation state hence has no unpaired electron thus it is colourless and diamagnetic. Though K2Cr2O7 has no unpaired electron but it is coloured.thus is due to charge transfer.

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