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A variable, opposite external potential(...

A variable, opposite external potential`(E_(ext)` is applied to the cell :`Zn|Zn^(2+)(1M)||Cu^(2+) (1M)|Cu, ` of potential 1.1 V.respectively electrons flow from :

A

anode to cathode in both cases

B

cathode to anode and anode to cathode

C

anode to cathode and cathode to anode

D

cathode to anode in both cases

Text Solution

Verified by Experts

The correct Answer is:
C
EMF of galvanic cell = 1.1 volt
If `E_("ext") lt EMF` then electron flows steadily from anode to cathode while . If `E_("ext") gt EMF` there electron flows from cathode to anode as polarity is changed .
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A variable, opposite external potential (E_(ext)) is applied to the cell Zn| zn^(2+)(1M) || Cu^(2+)(1M)| Cu , of potential 1.1 V. When E_(ext) lt 1.1V and E_(ext) gt 1.1 V , respectively electrons flow from:

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DISHA PUBLICATION-ELECTROCHEMISTRY -Exercise
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  2. Galvanization is applying a coating of:

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  3. A variable, opposite external potential(E(ext) is applied to the ce...

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  4. At 298 K, the standard reduction potentials are 1.51 V for MnO(4)^(-) ...

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  5. Two faraday of electricity is passed through a solution of CuSO(4). Th...

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  6. The standard electrode potentials (E(M^(+)//M)^(@)) of four metals A, ...

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  7. A currrent of 5.0 A flows for 4.0 h through an electrlytic cell contai...

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  8. Standard electrode potential data is given below : Fe^(3+) (aq) + e ...

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  9. Resistance of 0.2 M solution of an electrolyte is 50Omega . The specif...

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  10. The equivalent conductance of NaCl at concentration of C and at infini...

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  11. Given below are the half -cell reactions Mn^(2+)+2e^(-) to Mn, E^(@)...

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  12. The function of a salt bridge is to:

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  13. Standard electrode potential of SHE at 298 K is :

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  14. The satandard EMF of quinhydrone is 0.699V. The EMF of the quinhydrone...

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  15. If e(Fe^(2+) //Fe)^@ =- 0. 44 1V. And E(Fe^(3+)//Fe^(2+))^(o) = 0. 771...

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  16. In the electrolytic cell, flow of electrons is form :

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  17. Given E(Cr^(3+)//cr)^@ =- 0.72 V, E(Fe^(2+)//Fe)^@ =- 0.42 V. The pote...

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  18. Which of the following reaction is possible at anode ?

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  19. Which one is not called a anode reaction from the following?

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  20. Which of the following statements is true for an electrochemical cell ...

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