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What is a secondary cell? Write the equa...

What is a secondary cell? Write the equation for the cathodic reaction of lead storage battery ?

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Secondary cell - cell which can be recharged and used repcatedly .
cathodic equation `PbO_2 + SO_(4)^(2-) +4H^+ 2e` to `PbSO_2 +2H_2O`
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