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Match the following columns...

Match the following columns

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A, B, C, D
`Koverset(+7)(Mn)O_(4) rarr Mn^(2+)`
`overset(+2)(Mg)overset(+3)(C_(2))O_(4) rarr Mg^(2+)+overset(+4)(C)O_(2)`
`K_(2) overset(+6)(Cr_(2)) O_(7) rarr Cr^(3+)`
`overset(+6)(Cr)O_(5) rarr overset(+3)(Cr_(2))O_(3)`
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