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During discharge of a lead storage cell ...

During discharge of a lead storage cell the density of sulphuric acid in the cell:

A

increasing

B

decreasing

C

remains uncharged

D

initially increases but decreases subsequently

Text Solution

Verified by Experts

The correct Answer is:
B
Sulphuric acid works as an electrolyte in ideal cell due to consumption its density decreases.
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During the discharge of a lead storage battery, the density of sulphuric acid fell from 1.294 g mL^(-1) to 1.139 g mL^(-) . Sulphuric acid of density 1.294 g mL^(-1) is 39% by weight and that of density 1.139 g mL^(-1) is 20% by weight. The battery hold 3.5 litre of acid and discharge. Calculate the no. of ampere hour for which the battery must have been used. The charging and discharging reactions are: Pb+SO_(4)^(2-) rarr PbSO_(4)+2e (charging) PbO_(2)+4H^(+)+SO_(4)^(2-)+2e rarr PbSO_(4)+2H_(2)O (discharging)

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