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Out of the following how many of them ar...

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+)`

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