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In hydrogen electrode, why is the platin...

In hydrogen electrode, why is the platinum foil covered with platinum black?

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Standard reduction potential of the electrode X|X^(+) is +0.80V. If this electrode is connected to a standard hydrogen electrode, What will be the direction of electron flow in the outer circuit?

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Knowledge Check

  • Platinum black is -

    A
    a mixture of Pt and `MnO_(2)`
    B
    the black powder obtained when `PtCl_(4)` is reduced by sodium formate
    C
    a black coating on Pt
    D
    None of the above

  • A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at 1 atm pressure. The oxidation potential of electrode would be -

    A
    1.18V
    B
    0.059V
    C
    0.59V
    D
    0.118V

  • The value of standard hydrogen electrode potential is taken as zero, because -

    A
    hydrogen has a high reducing power
    B
    hydrogen is the lightest element
    C
    according to convention, its potntilal is taken as zero
    D
    this electrode can be easily constructed

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    A platinum foil coated with platinum black is dipped in an acid solution through which pure hydrogen gas is bubbled. This is a hydrogen electrode. State the conditions at which it will act as a standard hydrogen electrode.

    The standard reduction potential of Zn^(2+)|Zn electrode is -0.76 V . What will be the electrode reactions if this electrode is coupled with a standard hydrogen electrode?

    What will happen during the electrolysis of equeous solution of CuSO_(4) by using platinum electrodes -

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