Out of the following how many of them are coloured compounds.
`MnO_4^(ɵ),Cr_2O_7^(2-),CrO_4^(2-),Sc^(3+),Ti^(4+),Zn^(2+),Mn^(3+),Cu^(2+),Fe^(2+),Fe^(3+)`

Explanation

To determine how many of the given compounds are colored, we need to analyze each compound based on the presence of unpaired electrons and the possibility of d-d transitions or charge transfer spectra. Let's go through each compound step by step:

1. **MnO₄⁻ (Permanganate ion)**:
- This compound exhibits charge transfer spectra, which gives it a color.
- **Conclusion**: Colored.

2. **Cr₂O₇²⁻ (Dichromate ion)**:
- This compound also exhibits charge transfer spectra, leading to its characteristic color.
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