why does dry cells become dead even if they are left unused?
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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.)
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