Q.

Of the ions Zn2+,Ni2+  and Cr3+ (At.Nos Zn =30, Ni = 28, Cr = 24)

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a

Only Zn2+  is colourless and Ni2+  and Cr3+  coloured

b

All three are colourless

c

All three are coloured

d

Only Ni2+   is coloured and Zn2+  and Cr3+  are colourless

answer is A.

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Detailed Solution

Electronic configurationOf Zn2+[Ar]3d10 4s0; Ni2+[Ar]3d8,4s0Cr3+[Ar]3d3,  4s0  Zn2+  colourless (no unpaired electrons)Ni2+  and Cr3+  coloured due to unpaired electrons
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