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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