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Of the ions Zn^(2), Ni^(2 +) and Cr^(3 +...

Of the ions `Zn^(2), Ni^(2 +)` and `Cr^(3 +)` [atomic number of `Zn = 30, Ni = 28, Cr = 24`]

A

Only `Zn^(2+)` is colourless and `Ni^(2+)` and `Cr^(3+)` are coloured

B

All three are colourless

C

All three are coloured

D

Only `Ni^(2+)` is coloured and `Zn^(2+)` and `Cr^(3+)` are colourless

Text Solution

Verified by Experts

The correct Answer is:
A
`Na^(2+)` and `Cr^(2+)` are coloured. But `Zn^(2+)` is colourless because of absence of unpaired `e^(-).`
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