Which of the following ions are expected to be coloured ?
`Ni^(2+) , Ti^(3+) , Cu^(+) , Sc^(3+) , Zn^(2+)`

Explanation

To determine which of the given ions are expected to be colored, we need to analyze their electronic configurations and check for the presence of unpaired electrons. The presence of unpaired electrons in the d-orbitals is what typically leads to the color in transition metal ions due to d-d transitions.

### Step-by-Step Solution:

1. **Identify the ions**: The ions we need to analyze are:
- Ni²⁺
- Ti³⁺
- Cu⁺
...