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How many Faradays are needed to reduce 1...

How many Faradays are needed to reduce 1 mole of `MnO_(4)^(-)` to `Mn^(2+)`?

A

1

B

2

C

3

D

5

Text Solution

Verified by Experts

The correct Answer is:
D
`MnO_(4)^(-)+8H^(+)+5e^(-)rarr Mn^(2+)+4H_(2)O=5F`
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ALLEN-ELECTROCHEMISTRY-Part (II) EXERCISE-01
  1. For the electrochemicl cell, M|M^(+)||X^(-)|X E((M^(+)//M))^(@) = 0.44...

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  2. For the net cell reaction of the cell Zn(s) |Xn^(2+) ||Cd^(2+) |Cd(s) ...

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  3. How many Faradays are needed to reduce 1 mole of MnO(4)^(-) to Mn^(2+...

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  4. Cu^(+) + e rarr Cu, E^(@) = X(1) volt, Cu^(2+) + 2e rarr Cu, E^(@) =...

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  5. Zn|Zn((C(1)))^(2+)||Zn((C(2)))^(2+)| Zn(s). Then DeltaG is -ve if

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  6. Pt(H(2))(p(1))|H^(o+)(1M)|(H(2))(p(2)),Pt cell reaction will be exergo...

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  7. Pt |{:((H(2))),(1atm):}:| pH = 2:|:|:pH =3 |:{:((H(2))Pt),(1atm):}:|. ...

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  8. M^(2+) +2e rarr M. 0.275 g of metal M is deposited at the cathode due ...

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  9. In an electrochemical cell that function as a voltaic cell:-

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  10. A certain metal salt solution is electrolysed in series with a silver ...

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  11. The cell Pt(H(2))(1atm) |H^(+) (pH =?) T^(-) (a=1)AgI(s), Ag has emf, ...

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  12. Using the information in the preceding problem, calculate the solubili...

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  13. If same quantity of electricity is passed through CuCI and CuSO(4) the...

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  14. For Zn^(2+) //Zn, E^(@) =- 0.76, for Ag^(+)//Ag, E^(@) = -0.799V. The...

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  15. The oxidation potential of a hydrogen electrode at pH = 10 and P(H(2))...

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  16. If x is specific resistance of the electrolyte solution and y is the m...

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  17. E^(@) (SRP) of different half cell given {:(E(Cu^(2+)//Cu)^(@) =0.34...

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  18. The conductivity of a saturated solution of Ag(3)PO(4) is 9 xx 10^(-6)...

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  19. A saturated solution in AgA (K(sp)=3xx10^(-14)) and AgB (K(sp)=1xx10^(...

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  20. An equeous solution of Na(2)SO(4) was electrolysed for 10 min. 82 ml o...

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