Of the ions Zn 2+ , Ni 2+ and Cr 3+ (atomic number Zn = 30, Ni = 28, Cr = 24) :
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Valence shell electron configuration of 30 Zn 2+ is 3d 1 º 4sº. As there is no unpaired electrons for d–d transition, the solution of ions will be colourless.
Valence shell electron configuration of 28 Ni 2+ is 3d 8 4sº. As there are 2 unpaired electrons, there is d–d transition of electron, so the solution of ions will be coloured.
Valence shell electron configuration of 24 Cr 3+ is 3d 3 4sº. As there are 3 unpaired electrons, there is d–d transition of electron, so the solution of ions will be coloured.
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