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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 the discharge of a lead storage battery, the density of sulphuric acid fell from 1.294 to 1.139 g/mL. Sulphuric acid of density 1.294 g/mL is 39% H_(2)SO_(4) by wt. and that of density 1.139 g/mL is 20% by weight. The battery holds 3.5 litres of the acid and the volume remained practically constant during the discharge. Calculate the number of ampere-hours for which the battery must have been used. The charging and discharging reactions are Pb + SO_(4)^(2) = PbSO_(4) + 2e (charging) PbO_(2) + 4H^(+) + SO_(4)^(2-) + 2e^(-) = PbSO_(4) + 2H_(2)O (discharging)

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

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    Explore conceptually related problems

    During the discharge of a lead storage battery, the density of sulphuric acid fell from 1.294 g/m to 1.139 g/m. Sulphuric acid of density 1.294 g/m was 39% H_2SO_4 by wt. while acid of density 1.139 g/ m contains 20% acid by wt. The battery holds 3.5 L of acid and the value remianed practically same through the discharge. Catculate the number of amp hr. for which the battery must have been used. The charging and discharging reactions are : PbO_2 +SO_4^(2-) + 4H^+ + 2e^(-) to PbSO_4 + 2H_2O (discharging ) PbSO_4 (s) +2e to Pb (s) + SO_4^(2-) (charging )

    During the discharge of lead storage battery, the derisity of sulphuric acid fell from 1.294 to 1.139 gm/ml. Sulphuric acid of density 1.294 gm/ml is 39\% H_2SO_4 by weight and that of density 1.139 gm/ml is 20\% by weight. The battery holds 3.5 litres of acid and volume remained practically constant during the discharge. Calcutate the ampere hour for which the battery must have been used. The charging and discharging reactions are Pb+SO_(4)^(2-) to PbSO_(4)+2e (charging) PbO_(2)+4H^(+)+SO_(4)^(2-)+SO_(4)^(2-) +2e to PbSO_(4)+2H_(2)O (discharging)

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

    During the charging of storage cell

    During recharging of lead storage cell , __________.

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