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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

Inceasing

B

Decreasing

C

Remains unchanged

D

Initially increases but decrease subsequentily

Text Solution

Verified by Experts

The correct Answer is:
B
Discharging reaction
`Pb(s) + PhO_2 (s) + 2H_2SO_4 rarr 2 PbSO_4 2H_2O`.
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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)

During discharging of alead storage battery

During discharge in the case of lead storage batteries density of sulphuric acid

During recharging of lead storage cell , __________.

Knowledge Check

  • During charging of lead storage cell

    A
    external emf is greater than the emf of cell
    B
    external emf is equal to the emf of cell
    C
    external emf is less than emf of the cell
    D
    none of these

  • During discharging of alead storage battery

    A
    The reaction at anode is `Pb rarr Pb^(2+)+2e^(-)`
    B
    The reaction taking place at cathode is
    `Pb^(2+)+2e^(-) rarr Pb`
    C
    The overall reaction is
    `Pb+PbO_(2)+4H^(o+) +2SO_(4)^(2-) rarr 2PbSO_(4)+2H_(2)O`
    D
    The reaction taking place at cathode is
    `PbO_(2)+4H^(o+)+2e^(-) rarr Pb^(2+)+2H_(2)O`

  • During discharge in the case of lead storage batteries density of sulphuric acid

    A
    increases
    B
    decreases
    C
    remains unchanged
    D
    may decrease or increase