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In which of the following pairs are both the ions coloured in aqueous solution?
(a) \( \mathrm{Sc}^{3+}, \mathrm{Co}^{2+} \)
(b) \( \mathrm{Ni}^{2+}, \mathrm{Cu}^{+} \)
[CBSE (PMT) 2006]
\( P \)
(c) \( \mathrm{Ni}^{2+}, \mathrm{Ti}^{3+} \)
(d) \( \mathrm{Sc}^{3+}, \mathrm{Ti}^{3+} \)
W.
(At.no. : \( \mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{Ni}=28, \mathrm{Cu}=29, \mathrm{Co}=27 \) ).
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