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Q.

The set having ions which are coloured and paramagnetic both is :

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a

Cu2+, Cr3+, Sc+

b

Cu2+ , Zn2+ , Mn4+

c

Sc3+ , V 5+ , Ti4+

d

Ni2+ , Mn7+ , Hg2+

answer is A.

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Detailed Solution

Cu2+:[Ar]3d94s0Cr3+:[Ar]3d34s0Sc+:[Ar]3d14s1All are coloured and paramagnetic due to presence of unpaired electrons.
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The set having ions which are coloured and paramagnetic both is :