In which of the following pairs are both the | vedclass

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Question

$\mathrm{Sc} \rightarrow[\mathrm{Ar}] 3 d^{1} 4 s^{2}, \mathrm{Sc}^{3+} \rightarrow[\mathrm{Ar}]$

$\mathrm{Ti} \rightarrow[\mathrm{Ar}] 3 d^{2} 4 s

Vedclass · Accepted Answer

$Ni^{2+}, Ti^{3+}$

Vedclass · Answer

$\mathrm{Sc} \rightarrow[\mathrm{Ar}] 3 d^{1} 4 s^{2}, \mathrm{Sc}^{3+} \rightarrow[\mathrm{Ar}]$

$\mathrm{Ti} \rightarrow[\mathrm{Ar}] 3 d^{2} 4 s^{2}, \mathrm{Ti}^{3+} \rightarrow[\mathrm{Ar}] 3 d^{1}$

$\mathrm{Ni} \rightarrow[\mathrm{Ar}] 3 d^{8} 4 s^{2}, \mathrm{Ni}^{2+} \rightarrow[\mathrm{Ar}] 3 d^{8}$

$\mathrm{Cu} \rightarrow[\mathrm{Ar}] 3 d^{10} 4 s^{1}, \mathrm{Cu}^{+} \rightarrow[\mathrm{Ar}] 3 d^{10}$

$\mathrm{Co} \rightarrow[\mathrm{Ar}] 3 d^{7} 4 s^{2}, \mathrm{Co}^{2+} \rightarrow[\mathrm{Ar}] 3 d^{2}$

$\mathrm{Ti}^{3+}, \mathrm{Ni}^{2+}$ and $\mathrm{Co}^{2+}$ are coloured due to presence of unpaired electrons.

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$)

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