When acidified solution of $K_{2} {Cr}_{2} O_{7}$ is shaken with aqueous solution of ${FeSO}_{4}$ then :

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${Cr}_{2} O_{7}^{2 -}$ ion is converted to ${CrO}_{3}$

${Cr}_{2} O_{7}^{2 -}$ ion is reduced to $Cr$

${Cr}_{2} O_{7}^{2 -}$ ion is reduced to ${Cr}^{3 +}$ ions

${Cr}_{2} O_{7}^{2 -}$ - ion is converted to ${CrO}_{4}^{2 -}$ ions

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Detailed Solution

When an acidified solution of $K_{2} {Cr}_{2} O_{7}$ is shaken with an aqueous solution of ${FeSO}_{4}$ then ${Cr}_{2} O_{7}^{2 -}$ the ion is reduced to ${Cr}^{3 +}$ ions.

The dichromate(VI) ion ${Cr}_{2} {O_{7}}^{2 -}$ is the oxidizing agent. As a result, ${Cr}^{3 +}$ chromium(III) ions are produced.

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