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