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Q.

The pair of ions which do not have diamagnetic nature

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a

Cu1+ and Zn2+

b

Ca2+ and Zn2+

c

Sc3+ and Ti4+

d

V2+ and Fe2+

answer is D.

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Detailed Solution

V2+= 3d34s0[3 unpaired electrons] (paramagnetic) Fe2+= 3d64s0 [4 unpaired electrons] ( paramagnetic)  (Cu+1 ,Zn+2); (Sc+3 ,Ti+4); (Ca+2,Zn+2) all pairs are diamagnetic due to absence of unpaired electrons

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The pair of ions which do not have diamagnetic nature