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Reduction potential of hydrogen using di...

Reduction potential of hydrogen using dil sulphuric acidof pH=5 at a pressure of hydrogen gas of 1 bar is

A

A. 0.059V

B

B. `-0.295V`

C

C. `-0.059V`

D

D. `-2.95V`

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The reduction potential of hydrogen electrode will be negative if :

A cylinder with a movable piston constant moles of hydrogen air standard temperature and pressure. The walls of the cylinder are made of a heat insulator, and the piston is insulated by having a pile of sand on it. By what factor does the pressure of the gas increase if the gas is compressed to half its original volume?

What is the potential of a hydrogen electrode at pH=10?

Two metals P and Q have reduction potentials of -0.44 V and +0.77 V respectively. Which metal can liberate hydrogen from dilute acids ?

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Knowledge Check

  • The reduction potential of hydrogen half-cell will be negativeif:

    A
    `pH_(2) = 2 atm and [H^(+)] = 2.0 M`
    B
    `pH_(2) = 1 atm and [H^(+)] = 2.0 M`
    C
    `pH_(2) = 1 atm and [H^(+)] = 1.0 M`
    D
    `pH_(2 )= 2 atm and [H^(+)] = 1.0 M`

  • Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium. The kientic energy of the fastest photoelectrons emitted from sodium is 0.73 eV. The work function for sodium is 1.82 eV. Ionization potential of hydrogen is 13.6 V and the mass of hydrogen atom =1.67 xx 10^(-27)kg . The energy of the photons causing the photoelectric emission is

    A
    `1.168 xx 10^(-19)J`
    B
    `2.912 xx 10^(-19)J`
    C
    `1.744 xx 10^(-19)J`
    D
    `4.08 xx 10^(-19)J`

  • Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium. The kientic energy of the fastest photoelectrons emitted from sodium is 0.73 eV. The work function for sodium is 1.82 eV. Ionization potential of hydrogen is 13.6 V and the mass of hydrogen atom =1.67 xx 10^(-27)kg The quantum numbers of the two levels in the emission of the photons, where the energy difference is 2.55 eV are

    A
    `n=1,n=4`
    B
    `n=1,n=3`
    C
    `n=2, n=4`
    D
    `n=3, n=4`
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