Question

give reason why a simple cell cannot be used for a very long time??​

Answer 1

A traditional dry cell comprises a zinc anode, usually in the form of a cylindrical pot, with a carbon cathode in the form of a central rod.

The electrolyte is ammonium chloride in the form of a paste.

If the cell is left unused, this elctrolyte may get dried up, killing it.

Modern cells, lithium, cadmium etc., are free from this, but they may explode.