The cell emf in a cell with cell reaction Cr2O72−+14H++6Fe+2→2Cr+3+6Fe+3+7H2O could be increased above the standard emf by

Decreasing [Fe +3 ] , Decreasing the pH

If Cr 2 O 7 − 2 , H + , Fe + 2 conc. increases or Cr +3 , Fe +3 , conc. decreases then E increases.

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The cell emf in a cell with cell reaction ${Cr}_{2} O_{7}^{2 -} + 14 H^{+} + 6 {Fe}^{+ 2} \to 2 {Cr}^{+ 3} + 6 {Fe}^{+ 3} + 7 H_{2} O$ could be increased above the standard emf by

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Decreasing [Fe⁺³]

Increasing [Cr⁺³]

Decreasing [ ${Cr}_{2} O_{7}^{2 -}$ ]

Decreasing the pH

answer is A, D.

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If ${Cr}_{2} O_{7}^{- 2}, H^{+}, {Fe}^{+ 2}$ conc. increases or Cr⁺³, Fe⁺³, conc. decreases then E increases.

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