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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 unchanged

D

initially increases but decreases subsequently.

Text Solution

Verified by Experts

The correct Answer is:
B
`H_(2)-O_(2)` fuel cell
at anode: `2OH^(-)+H_(2)to2H_(2)O+2e^(-)`
At cathode: `2H_(2)O+O_(2)+4e^(-)to4OH^(-)`
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During the discharge of a lead storage battery, the density of sulphuric acid fell from 1.294g mL^(-1) to 1.139g mL^(-1) . Sulphuric acid of dencity 1.294g mL^(-1) is 39% by weight and that of density holds 3.5 litre of acid and the volume practically remained constant during the 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_(2O) (dischargeing)

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