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  4. Compound that is both paramagnetic and coloured is

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Q. Compound that is both paramagnetic and coloured is

AIIMSAIIMS 2017The d-and f-Block Elements

Solution:

$K_2Cr_2O_7$ contains $Cr^{6+}(3d^0)$ which is diamagnetic but coloured due to charge transfer spectra. $(NH_4)_2[TiCl_6]$ contains $Ti^{4+}(3d^0)$, which is diamagnetic and colourless.
$VOSO_4$ contains $V^{4+}(3d^1)$, which is paramagnetic and coloured.
$K_3[Cu (CN)_4]$ contains $Cu^+(3d^{10})$, which is diamagnetic and colourless.