When acidified solution of potassium dichromate is shaken with aqueous solution of ferrous sulphate then

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${Cr}_{2} O_{7}^{- 2}$ ion is reduced to ${Cr}_{2} O_{4}^{- 2}$

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

${Cr}_{2} O_{7}^{- 2}$ ion is oxidised to CrO₃

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

answer is A.

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Detailed Solution

The chromium ion has ability to accept the electrons and ferrous ion has ability to release the electrons.
In this reaction the chromium ion oxidizes the ferrous ion and reduce itself into +3 ions.

This process is called redox reaction.

$K_{2} {Cr}_{2} O_{7} + 6 {FeSO}_{4} + 7 H_{2} {SO}_{4} \to K_{2} {SO}_{4} + {Cr}_{2} {({SO}_{4})}_{3} + 3 {Fe}_{2} {({SO}_{4})}_{3} + 7 H_{2} O$

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