1.

In which of thc following pairs are both the ions coloured in aqueous solution ? (At no: Sc=21, Ti=22, Ni=28, Cu=29, Co=27)

Answer»

`Ni^(2+),Cu^(+)`
`Ni^(2+),TI^(3+)`
`SC^(3+),Ti^(3+)`
`Sc^(3+),CO^(2+)`

ANSWER :B


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