A metal used in storage batteries is:

C u

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P b

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S n

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N i

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Solution

The correct option is B $P b$
$P b$ metal used in secondary cell which is a lead storage battery.
Overall reaction in the battery
$P b (s) + P b O_{2} (s) + 2 H_{2} S O_{4} (a q) ⟶ 2 P b S O_{4} (s) + 2 H_{2} O (g)$

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P b + H_{2} S O_{4} \to P b S O_{4} + 2 H^{+} + 2 e^{-}

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