In following pairs, the one in which both transition metal ions are colourless is :

Question

$\mathrm{Sc}^{3+}, \mathrm{Zn}^{2+}$

$\mathrm{Ti}^{4+}, \mathrm{Cu}^{2+}$

$\mathrm{V}^{2+}, \mathrm{Ti}^{3+}$

$\mathrm{Zn}^{2+}, \mathrm{Mn}^{2+}$

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