Amongst the following the compound that is both paramagnetic and coloured is

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K2Cr2O7

NH42TiCl6

CoSO4

K3Cu(CN)4

answer is C.

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Detailed Solution

In NH42TiCl6,Ti4+3 d04 s0 has no unpaired electrons. In K2Cr2O7,Cr6+3p6 d0 has no unpaired electrons. In CoSO4,Co2+d7 has unpaired electrons in d-orbitals, so it is both paramagnetic and coloured. In K3Cu(CN)4,Cu+3 d10, has no unpaired electron.

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