NEET Practice Questions

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NEET, 2006

In which of the following pairs are both the ions coloured in aqueous solution?

(a) Ni2+, Ti3+              (b) Sc3+, Ti3+

(c) Sc3+, Co2+            (d) Ni2+, Cu+

(At. no : Sc =21, Ti = 22, Ni = 28, Cu = 29, Co = 27)