Question

The colour of Ni\(^{2+}\) is \(\underline{\hspace{2cm}}\)

Hint:

Transition metal ions often show color due to electronic transitions in their d-orbitals.

Answer 1

Step 1: Colour of Ni\(^{2+}\).
The color of Ni\(^{2+}\) ions in aqueous solution is green. This is due to the electronic transitions in the \( d \)-orbitals of the Ni\(^{2+}\) ion.

Step 2: Conclusion.
The color of Ni\(^{2+}\) is green.