The ionic charges on chromate ion and dichromate ion respectively is:
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- -2, -2
Chromate salts contain the chromate anion, $\text{CrO}^{2-}_4$ with -2 ionic charge.
Dichromate salts contain the dichromate anion, $\text{CrO}^{2-}_7$ with -2 ionic charge.
They are oxoanions of chromium in the +6 oxidation state.
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