Question

If the following ion is coloured enter 1, else enter 0.

$N{i}^{2+}$

Answer 1

Color of $N{i}^{2+}$ is light green because Ni is a transition metal.

The reason for transition metal ions to be coloured is following:

In a normal metal atom, the only possible energy jumps are too great for visible light to be affected, and so the solutions appear colourless. However, transition metals are different. When there are ligands present, the 3d level splits up into two levels of energy, with two orbitals at a slightly higher level and three at a lower level. The energy jump when an electron is transferred between two of these levels corresponds to the energy of visible light. This is why the solutions of the transition ions are coloured.

Hence, answer is 1