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QAIPMT-2006-Ch-2398: NEET 2006 Chemistry - Class 12 AIPMT-2006-Ch-2398 Solution: In which of the following pairs are both the ions coloured in…

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)

Multiple Choice Options

A $Ni^{2+}, Cu^+$
B $Ni^{2+}, Ti^{3+}$
C $Sc^{3+}, Ti^{3+}$
D $Sc^{3+}, Co^{2+}$ .

Step-by-Step Verified Solution

For Ni +2 = [Ar] 3d 8 4s 0 (2 Unpaired electrons) Ti +3 = [Ar] 3d 8 4s 0 (1 unpaired electron) Sc +3 = [Ar] (0 unpaired electron) Cu + = [Ar] 3d 10 (0 unpaired electron) Hence, Ni +2 and Ti 3+ are coloured in aqueous solution due to the presence of unpaired electrons in d-subshell.

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