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The thermoelectric pewers of Pt, Ni and ...

The thermoelectric pewers of Pt, Ni and Fe are -4 , -21 and `12 muV` per `0^(@)C` respectively . What will be the magnitude of emf of Pt-Ni and Ni-Fe thermocouples with junctions at `0^(@)C` and `100^(@)C` ?

Answer

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Thermocouples are used to measure temperature in the linear parts of the emf versus temperature graph wilth cold junction at 0^(@)C . The thermo electric power of Pt, Ni thermocouple are =-4 and -20 microcolt per .^(@)C respectively. What will be the magnitudes of emfs of the thermocopule when thecold junction is at 0^(@)C and the hot junction is at 100^(@)C ?

The thermoelectric powers of iron and nickel with respect to lead are +12 and -20 muV respectivelty at 50^(@)C . Find the emf of the an iron-nickel thermocouple with junctions at 0^(@)C and 100^(@) C.

Knowledge Check

  • The standard reduction potentials for Zn^(2+)//Zn, Ni^(2+)//Ni and Fe^(2+)//Fe are -0.76,-0.23 and -0.44 V respectively. The reaction X+ Y^(2+)toX^(2+)+Y will be spontaneous when

    A
    `X=Zn,Y=Ni`
    B
    `X=Ni,Y=Fe`
    C
    `X=Ni,Y=Zn`
    D
    `X=Fe,Y=Zn`

  • The standard reduction potentials for Zn^(2+)//Zn,Ni^(2+) and Fe^(2+)//Fe are -0.76,-0.23 and -0.44V respectively. The reaction X+Y^(2+)toX^(2+)+Y will be spontaneous when

    A
    `X=Ni,Y=Fe`
    B
    `X=Ni,Y=Zn`
    C
    `X=Fe,Y=Zn`
    D
    `X=Zn,Y=Ni`

  • The standard reduction potential for Zn^(2+)//Zn, Ni^(2+)//Ni and Fe^(2+)//Fe are -0.76,-0.23 and -0.44" V " respectively. The reaction X+Y^(2+) to X^(2)+Y will be spontaneous when :

    A
    X=Ni, Y=Fe
    B
    X=Ni , Y=Zn
    C
    X=Fe , Y=Zn
    D
    X=Zn , Y=Ni

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