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Q.

Which set has all the coloured ions?

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a

Cu+,Cu2+,Ni2+

b

Cu2+,Fe2+,Co2+

c

Cu2+,Co2+,Sc3+

d

Na+,Mg2+,Al3+

answer is B.

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Detailed Solution

Cu+ is colourless and Sc3+ is colourless.Na+,Mg2+,Al3+--colourlessas they have no unpaired electron in d-orbitals.
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