Normalities of sulphuric acid before and after discharge are:

5.15, 2.32

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2.32, 5.15

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5.15, 5.15

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2.32, 2.32

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Solution

The correct option is A $5.15, 2.32$
ANS; A
mass of sulfuric acid before discharge = 1.294 3.51000.39 = 1766.31 gm
normality of sulfuric acid before discharge = $\frac{1766.3}{98 \times 3.5}$
= 5.15 N
mass of sulfuric acid after discharge = 1.139 3.510000.20 = 797.3 gm
normality of sulfuric acid after discharge = $\frac{797.3}{98 \times 3.5}$
= 2.32 N

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. Sulphuric acid of density

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is 39% by weight and that of density

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is 20% by weight. The battery holds 3.5 L of the acid and the volume remained practically constant during the discharge. Find the number of ampere-hours for which the battery must has been used.

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$P b + S O {_{4}}^{2 -} \to P b S O_{4} + 2 e^{-}$ (charging)

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