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Question:

Among the following the compounds which one is both paramagnetic and coloured?

(NH4)2[TiCl6]

VOSO4

K3[Cu(CN)4]

K2Cr2O7

Solution:

InK2Cr2O7, theCris in +6 oxidation state.Electronic configuration ofCr+6=3d0In(NH4)2[TiCl6],theTiis in+4oxidation state.Electronic configuration ofTi+4=3d0InVOSO4,Vis in+4oxidation state.Electronic configuration ofV+4=3d1It contains 1 unpaired electron.K3[Cu(CN)4]→Cu+:3d10VOSO4, due to the presence of one unpaired electron, is paramagnetic and coloured.Hence, option C is the answer.