NEETChemistryD and F Block ElementsMCQ+4 / −1
In which of the following pairs are both the ions coloured in aqueous solution?
(At. no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)
(At. no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)
- ANi2+, Cu+
- BNi2+, Ti3+
- CSc3+, Ti3+
- DSc3+, Co2+.
View written solutionFree
Correct answer: B
For Ni+2 = [Ar] 3d84s0 (2 Unpaired electrons)
Ti+3 = [Ar] 3d84s0 (1 unpaired electron)
Sc+3 = [Ar] (0 unpaired electron)
Cu+ = [Ar] 3d10 (0 unpaired electron)
Hence, Ni+2 and Ti3+ are coloured in aqueous
solution due to the presence of unpaired electrons
in d-subshell.
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