Hi Saiharshvardhan!!
5 moles of ferrous sulphate will get oxidized to ferric sulphate with 1 mole of KMnO4 as there is acidic medium.
The left moles of ferrous sulphate will also get oxidized by K2Cr2O7. The number of moles of K2Cr2O7 required for the left of the reaction is 1 mole.
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