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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

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

B

all three are coloured

C

all three are colourless

D

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

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The correct Answer is:
A
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