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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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The cell which can be recharged by passing current in opposite direction and can be used again.
Cathodic reaction is `PbO_(2(s))+SO_(4(aq))^(2-)+H_((aq))^(+)+2e^(-)rarr PbSO_(4(S))+2H_(2)O_((l))`
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