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Of the ions `Zn^(2+),Ni^(2+) and Cr^(3+)` (atomic number Zn=30,Ni=28,Cr=24):A. only `Zn^(2+)` is colourless ad `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. |
| Answer» Correct Answer - A | |