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If galvanic cell is formed by standard h...

If galvanic cell is formed by standard hydrogen electrode with by `E_(Cu^(2+)|Cu)^(Theta)=+0.34V ` in standard condition, so what is `Cu^(2+)|Cu` electrode ?

A

Anode electrode, negative electrode

B

Cathode electrode, positive electrode

C

None of above

D

Anode positive electrode

Text Solution

Verified by Experts

The correct Answer is:
B
(a) `E_(cell)^(Theta)=E_("Cathod")^(Theta)-E_("Anode")^(Theta)`
`=E_(H^(+)|H_(2))^(Theta)-E_(Cu^(2+)|Cu)^(Theta)`
`=0.0-(0.34)=0.34V(A)` is wrong
(b) `E_(cell)^(Theta)=E_("Cathod")^(Theta)-E_("Anode")^(Theta)`
`=E_(Cu^(2+)|Cu)^(Theta)-E_(H^(+)|H_(2))^(Theta)`
`=0.34-0.0=0.34V` So, (B) is true.
Means, `Cu^(2+)|Cu` Cathode (Positive) electrode and `H^(+)|H_(2)` anode.
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Knowledge Check

  • Galvanic cell is formed by attaching two electrodes by salt bridge in standard condtion. Then which of the following is anode electrode ?

    A
    Electrodes with high `E_(cell)^(Theta)` value.
    B
    Electrodes with less `E_(cell)^(Theta)` value.
    C
    Standard hydrogen electrode.
    D
    None of above.

  • Assertion: Cu is less reactive than hydrogen. Reason : E_(Cu^(2+)//Cu)^(Theta) is negative.

    A
    Both assertion and reason are true and the reason is the correct explanation of assertion.
    B
    Both assertion and reason are true and the reason is not the correct explanation of assertion.
    C
    Assertion is true but the reason is false.
    D
    Both assertion and reason are false.

  • Which of the following is true for construct cell by E_(Cu^(2+)|Cu)^(Theta)=+0.34V and E_(H^(+)|H_(2))^(Theta)=0 ?

    A
    `Pt|H_(2(g))|H_((aq))^(+)(1M)||Cu_((aq))^(2+)(1M)|Cu_((S))`
    B
    `Pt|H_(2(g))(1" bar")|H_((aq))^(+)(1M)||Cu_((S))|Cu_((aq))^(2+)(1M)`
    C
    `Cu_((S))|Cu_((aq))^(2+)(1M)||H_((aq))^(+)(1M)|H_(2(a))(1" bar")|Pt`
    D
    `Pt|H_((aq))^(+)(1M)||H_(2(g))(1" bar")|Cu_((S))|Cu_((aq))^(2+)(1M)`

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