Question

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 1

Correct Answer - A