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The cell emf in a cell with cell reactio...

The cell emf in a cell with cell reaction `Cr_2O_7^(2-) + 14H^(+) + 6Fe^(+2) to 2Cr^(+3) + 6Fe^(+3) + 7H_2O` could be increased above the standard emf by

A

Increasing `[Cr^(+3)]`

B

Decreasing `[Fe^(+3)]`

C

Decreasing `[Cr_2O_7^(2-)]`

D

Decreasing the pH

Text Solution

Verified by Experts

The correct Answer is:
B, D
`E = E^(0) + (0.0591)/(n) log""([Cr_2O_7^(-2)][H]^(14) + [Fe^(+2)]^(6))/([Cr^(+3)][Fe^(+3)]^6)`
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AAKASH SERIES-ELECTROCHEMISTRY -LEVEL-II (LECTURE SHEET ( EXERCISE -I ( SINGLE & ONE OR MORE THAN ONE CORRECT ANSWER )))
  1. Identify the true ones

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  2. The cell emf depends on

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  3. The cell emf in a cell with cell reaction Cr2O7^(2-) + 14H^(+) + 6Fe^(...

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  4. Which of the following facts are true ?

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  5. In a lead storage battery

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  6. Which one is correct among the following give, the half cell emf's E^...

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  7. For the cell (at 298 K ) Ag((g)) // AgCl((s)) // Cl((aq))^(-) ||AgNO(3...

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  8. The value of the reaction quotient ,Q for the cell Zn(s) |Zn^(2+) (0.0...

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  9. DeltaG = DeltaH-TdeltaS and DeltaG = DeltaH + T[(d(DeltaG))/(dT)] " ...

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  10. For the cell Zn|Zn^(2+) (C1)||Zn^(2+) (C2)|Zn. DeltaG is negative if :

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  11. The Nernst equation , E = E^(0) -(RT)/(nF) . In Q indicates that the ...

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  12. The half cell reaction for the corrosion are , 2H^(+) + (1)/(2) O2 + ...

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  13. The E^(@) at 25^(@)C for the following reaction at the indicated conc...

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  14. A fuel cell develops an electrical potential from the combustion of b...

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  15. For a cell reaction 2H(2(g)) + O(2(g)) to 2H2O((l)) DeltaS(298)^(@) ...

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  16. Copper reduces NO3^(-) into NO and NO2 depending upon concentration of...

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  17. Consider the following standard reduction potentials Fe^(3+)(aq) + e...

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  18. Which of the following statements is / are correct ?

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  19. Which of the following facts regarding the movement of anions in the s...

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  20. Which of the following statements is correct ? If E(Cu^(2+)|Cu)^(@)...

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