Name a metal that can be used in the cathode protection of iron. Is it more active or less active than iron?

Answer:
Since  Zinc. It is more reactive than iron. thus it can be used in the cathode protection. 
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What is the basis of obtaining electrical energy in fuel cell?

Answer:
In fuel cell, the chemical energy of fuel is converted into electrical energy.
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Arrange the following metals in the order in which they displace each other?
Al, Cu, Fe, Mg, Zn


Answer:
reactivity order of these metal are :
Mg > Al > Zn > Fe > Cu.
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Write an expression to relate molar conductivity of an electrolyte to its degree of dissociation?

Answer:

Degree of dissociation:
α = Molar conductivity at concentration CMolar conductivity at infinte dilution.

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Why is it not possible to measure the voltage of an isolated reduction half reaction?

Answer:

The reduction half reaction cannot take place alone.
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