Q.

 Compound that is both paramagnetic and coloured is

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a

K2Cr2O7

b

[TiCl6].(NH4)2

c

VOSO4

d

 K3[Cu(CN)4]

answer is C.

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Detailed Solution

 K2Cr2O7  oxidation state Cr= +6

Cr6+ is [Ar]3d0

The oxidation state of V is +4 in VOSO4

V4+ is 3d1

K3[Cu(CN)4] 

Oxidation state of Cu = +1

Cu1+ is Ar[3d]10

[TiCl6].(NH4)2

Ti4+ configuration is 3d2

Has one unpaired d electron so it is paramagnetic and coloured.

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