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    Electrochemistry
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    How does fuel cell operate?
    Answer:

    In fuel cell, chemical energy of fuel is converted into electrical energy.
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    Give an example of “fuel celIs”.
    Answer:

    Galvanic cells that are designed to convert
    the energy of combustion of fuels like hydrogen, methane, methanol,
    etc. directly into electrical energy are called fuel cells.


    H    2—O2 fuel cell.
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    Which solution will allow greater conductance of electricity, 1 M NaCl at 293 K or 1 M NaCl at 323 K?

    Answer:
    1 M NaCl at 323 K will allow greater conductance of electricity as the ionic mobilities increase with increase in temperature.
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    Write the equation showing the relation between standard free energy and standard cell potential?
    ANswer:
    The relation between satandard free energy and standard cell potential is given by 
    ΔG° = – nFE°    cell.
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    Why is it impossible to obtain the electrode potential for a single half cell.
    Answer:

    This is because emf’s can only be measured for a completed circuit with two electrodes.
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