Why can a secondary cell be used again and again by recharging?

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Solution

A secondary cell can be used again and again by recharging because its electrochemical reaction is reversible. An electrochemical reaction is a chemical reaction which take place inside the secondary cell.
A secondary cell is a type of cell which can be recharged (i.e storage battery) by passing current through it in the opposite direction once the cell is discharged. Example: nickel-cadmium storage cell.

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