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What is nickel-cadmium cell ? State its ...

What is nickel-cadmium cell ? State its one merit and one demerit over storage cell. Write the overall reaction that occurs during discharging of this cell.

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Nickel-cadmium cell is a secondary cell and it is rechargeable.
Merit : It has a longer life than the storage cell.
Demerit : It is more expensive to manufacture.
The overall reaction when the discharging takes place is as under :
`Cd(s) + 2Ni(OH)_(3) to CdO (s) + 2Ni(OH)_(2) (s) + H_(2)O (l)`
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