Question
Explain Lead Storage Cell.
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Answer
Lead Storage Cell : This is the most commonly used battery in automobiles. Each battery consists of a number of voltaic cells connected in series. Three to six cells are generally combined to get 6 to 12 V battery. In each cell the anode is a grid of lead packed with finely
spongy lead and the cathode is a grid of lead packed with $PbO _2$.
During the working of the cell, the concentration of $H _2 SO _4$ decreases as sulphate ions are consumed to form $PbSO _4$. With the decrease in the concentration of $H _2 SO _4$ the density of the sulution also decreases. When the density of $H _2 SO _4$ becomes less than $1.20 g cm ^{-3}$, the battery needs reaching.
spongy lead and the cathode is a grid of lead packed with $PbO _2$.
During the working of the cell, the concentration of $H _2 SO _4$ decreases as sulphate ions are consumed to form $PbSO _4$. With the decrease in the concentration of $H _2 SO _4$ the density of the sulution also decreases. When the density of $H _2 SO _4$ becomes less than $1.20 g cm ^{-3}$, the battery needs reaching.
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Column $I ($Property$)$
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Column $II ($Element$)$
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| $(i)$ |
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$(a)$ | $Pm$ |
| $(ii)$ |
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$(b)$ | $Ce$ |
| $(iii)$ |
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| $(iv)$ |
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|
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| $(v)$ |
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$(e)$ | $Gd$ |
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$(f)$ | $Dy$ |