Which of the following pairs are both coloured in aqueous solution? W.....
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0Which of the following pairs are both coloured in
\( \mathrm{P} \)
aqueous solution?
W.
(1) \( \mathrm{Sc}^{3+}, \mathrm{Co}^{3+} \)
(2) \( \mathrm{Ni}^{2+}, \mathrm{Cu}^{2+} \)
(3) \( \mathrm{Ni}^{2+}, \mathrm{Ti}^{3+} \)
(4) \( \mathrm{Sc}^{3+}, \mathrm{Ti}^{3+} \)
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