Which is not different between primary and secondary cell ?

Reversibility of chemical reaction

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Rechargability of cell

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Supply of energy to external circuit

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Strength of current

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Solution

The correct option is C Supply of energy to external circuit
Both primary and secondary cells serve the purpose of supplying energy to external circuit. Chemical reactions are reversible and cell is rechargeable for only secondary cells. Strength of current in primary cell is low and in secondary cell can be high or low.

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