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The calomel electrode and Quinhydrone el...

The calomel electrode and Quinhydrone electrode are reversible with respect to which ions respectively:

A

`CI^(-),H^(+)`

B

`H^(+),CI^(-)`

C

`Hg_(2")^(2+)OH^(-)`

D

`Hg_(2)^(2+),OH^(+)`

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • A standard hydrogen electrode has zero electrode potential because

    A
    hydrogen is easiest to oxidise
    B
    this electrode potential is assumed to be zero
    C
    hydrogen atom has only one electron
    D
    hydrogen is the lightest element

  • Assertion :A standard hydrogen electrode is also called reversible electrode. Reason: Standard hydrogen electrode can act both as anode as well as cathode in an electrochemical cell.

    A
    If both (A) and (R) are correct and (R) is the correct explanation of (A).
    B
    If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
    C
    A is correct but R is incorrect
    D
    If both (A) and (R) are incorrect.

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    10. A student 'tried to find out the standard reduction'potentials of copper electrode and Zinc eleetrode separately using Normal Hydrogen Electrode as reference electrode. He obtained the reduction potentials of E^0 Cu^2 / Cu as 0.34 and E^prime zn^2+ / zn as- 0.76 . The, reference electrode acted here as cathode in one case and anode in theother.' 1. In which cases NHE acts as cathode and anode respectively. 2. Represent the electrode reactions of the NHE in both cases. 3. Represent the cell reaction when he used the Cu electrode and NHE. 4. Calculate the standard' potential of the cell constructed using Z_i n and Cu electrodes.

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