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Among the following the compound that is...

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

A

`K_(2)Cr_(2)O_(7)`

B

`(NH_(4))_(2)(TiCl_(6))`

C

`CoSO_(4)`

D

`K_(3)[Cu(CN)_(4)]`

Text Solution

Verified by Experts

The correct Answer is:
C
In `(NH_(4))_(2)(TiCl_(6)),Ti^(4+)(3d^(0)4s^(0))` has no unpaired electrons.
In `K_(2)Cr_(2)O_(7),Cr^(6+)(3p^(6)d^(0))` has no unpaired electrons.
In `CoSO_(4),Co^(2+)(d^(7))` has unpaired electrons in d- orbitals, so it is both paramagnetic and coloured.
In `K_(3)[Cu(CN)_(4)],Cu^(+)(3d^(10))`, no unpaired electron.
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