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In which of the following pairs, both th...

In which of the following pairs, both the ions are coloured in aqueous solutions ? (At. No. Se = 21, Ti = 22, Ni = 28, Co= 27, Cu = 29)

A

`Sc^(3+), Ti`

B

`Sc^(3+), Co^(2+)`

C

`Ni^(2+), Cu^(+)`

D

`Ni^(2+), Ti^(3+)`

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