Which of the following pairs have both ions colored in aqueous solution? [Atomic numbers of Sc = 21, Ti = 22, Ni = 28, Cu = 29, Mn = 25]

Question

$(\text{Sc}^{3+}, \text{Mn}^{2+})$

$(\text{Ni}^{2+}, \text{Ti}^{4+})$

$(\text{Ti}^{3+}, \text{Cu}^{+})$

$(\text{Mn}^{2+}, \text{Ti}^{3+})$

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