1.

The colourless species is (are):

Answer»

`VCl_3`
`VOSO_4`
`Na_3VO_4`
`[V(H_2O)_6]SO_4 . H_2O`

Solution :(A)`VCl_3 , ._23V^(3+) , [Ar]^16 3d^2=2` UNPAIRED electrons.
(B)`VO^(2+) , V^(4+) , [Ar]^18 3d^2=1` unpaired electrons.
(C )`[VO_4]^(3-) , V^(5+) , [Ar]^18 3d^0=no` unpaired electrons.
(D)`[V (H_2O)_6]^(2+) , V^(2+) , [Ar]^18 3d^3=3` unpaired electrons.


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