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In a lead storag battery, Pb (anode) and...

In a lead storag battery, Pb (anode) and `PbO_(2)` (cathode) are used. Concentrated `H_(2)SO_(4)` is used as electrolyte. The battery holds 3.5 litre acid with it . In the discharge process, the density of acid fell from 1.294 to 1.139 g/mL. The sulphuric acid of density `1.294" g mL"^(-1)` is 39 % by mass and that of density 1.139 g/mL is 20% by mass.
Equivalent mass of sulphuric acid in lead storage battery is :

A

49

B

98

C

24.5

D

none of these

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The correct Answer is:
B
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In a lead storag battery, Pb (anode) and PbO_(2) (cathode) are used. Concentrated H_(2)SO_(4) is used as electrolyte. The battery holds 3.5 litre acid with it . In the discharge process, the density of acid fell from 1.294 to 1.139 g/mL. The sulphuric acid of density 1.294" g mL"^(-1) is 39 % by mass and that of density 1.139 g/mL is 20% by mass. Which of the following takes place in discharge process at anode ?

In a lead storag battery, Pb (anode) and PbO_(2) (cathode) are used. Concentrated H_(2)SO_(4) is used as electrolyte. The battery holds 3.5 litre acid with it . In the discharge process, the density of acid fell from 1.294 to 1.139 g/mL. The sulphuric acid of density 1.294" g mL"^(-1) is 39 % by mass and that of density 1.139 g/mL is 20% by mass. The amount of charge which the battery must have been used is :

Acid used in lead storage battery is sulphuric acid.

Concentrated sulphuric acid has density of 1.9 g/mL and 99% H_(2)SO_(4) by mass. Calculate the molarity of the acid.

Knowledge Check

  • In a lead strage battery, Pb(anode) and PbO_(2) (cathode) are used. Concentrated H_(2)SO_(4) is used as electrolyte. The battery holds 3.5 llitre acid with it. In the discharge process, the density of acid fell from 1.294 to 1.139 g/mL. The sulphuric acid of dencity 1.294 g mL^(-1) is 39% by mass and that of density 1.139 g/mL is 20% by mass. Normalities of sulphuric acid before and after discharge are :

    A
    `5.15, 2.32`
    B
    `2.32, 5.15`
    C
    `5.15,5.15`
    D
    `2.32,2.32`

  • In a lead storag battery, Pb (anode) and PbO_(2) (cathode) are used. Concentrated H_(2)SO_(4) is used as electrolyte. The battery holds 3.5 litre acid with it . In the discharge process, the density of acid fell from 1.294 to 1.139 g/mL. The sulphuric acid of density 1.294" g mL"^(-1) is 39 % by mass and that of density 1.139 g/mL is 20% by mass. Which of the following takes place in discharge process at anode ?

    A
    `PbO_(2)+4H^(+)+SO_(4)^(2-) +2e^(-) rarr PbSO_(4)+2H_(2)O`
    B
    `PbSO_(4)+2H_(2)O rarr PBO_(2)+4H^(+)+SO_(4)^(2-) +2e^(-)`
    C
    `Pb+SO_(4)^(2-) rarr PbSO_(4)+2e^(-)`
    D
    `PbSO_(4) +2e^(-) rarr Pb+SO_(4)^(2-)`

  • In a lead storag battery, Pb (anode) and PbO_(2) (cathode) are used. Concentrated H_(2)SO_(4) is used as electrolyte. The battery holds 3.5 litre acid with it . In the discharge process, the density of acid fell from 1.294 to 1.139 g/mL. The sulphuric acid of density 1.294" g mL"^(-1) is 39 % by mass and that of density 1.139 g/mL is 20% by mass. The amount of charge which the battery must have been used is :

    A
    9.88 F
    B
    8.98 F
    C
    8.89 F
    D
    7.88 F
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