Batteries

IMPORTANT

Batteries: Overview

This topic covers concepts, such as, Electrical Batteries, Dry Cell, Lead Storage Battery, Discharging of Lead Storage Battery, Charging of Lead Storage Battery, Nickel-Cadmium Storage Cell & Types of Electrical Batteries etc.

Important Questions on Batteries

EASY
IMPORTANT

The type of cell in a lead storage battery is:

HARD
IMPORTANT

During the discharge of a lead storage battery, the density of sulphuric acid fell from 1.294 to 1.139   gm l 1 .  Sulphuric acid of density 1.294   gm l 1 is39%  by weight and that of 1.139   gm l 1 is20% H 2 S O 4  by weight. The battery holds 3.5 litres of the acid and the volume remained practically constant during the discharge.

The number of ampere-hours for which the battery must have been used. The charging and discharging reactions are:

Anode:

 Pbs+SO42aqPbSO4s+2e (discharging)

Cathode:

 PbO2s+4H+aq+SO42aq+2ePbSO4s+2H2Ol (discharging)

Note: Both the reactions take place at the anode and cathode respectively during discharge. Both reaction get reverse during charging.

MEDIUM
IMPORTANT

For lead storage battery pick the correct statements

A. During charging of battery, PbSO4 on anode is converted into PbO2

B. During charging of battery, PbSO4 on cathode is converted into PbO2

C. Lead storage battery consists of grid of lead packed with PbO2 as anode

D. Lead storage battery has ~38% solution of sulphuric acid as an electrolyte

Choose the correct answer from the options given below:

MEDIUM
IMPORTANT

Select the correct statement about the lead storage battery.

EASY
IMPORTANT

Select the incorrect statement while a lead storage battery is discharging.

HARD
IMPORTANT

Which of the following is correct labelling of lead storage battery:

Question Image

EASY
IMPORTANT

In hydrogen-oxygen fuel cell, the carbon rods are immersed in hot aqueous solution of:

MEDIUM
IMPORTANT

Which of the following is correct labelling of H2, O2 fuel cell:

Question Image

HARD
IMPORTANT

During the discharging of a lead storage battery the reaction occurring at anode is represented by:-

EASY
IMPORTANT

In the lead-acid battery during charging, the cathode reaction is

EASY
IMPORTANT

In H2-O2 fuel cell the reaction occurring at cathode is

EASY
IMPORTANT

Which of the following reaction occurs at anode during the recharging of lead storage battery ?

EASY
IMPORTANT

Which of the following reaction occurs at cathode in H2-O2 fuel cell ?

EASY
IMPORTANT

Which of the following will be formed when lead storage battery is charged?

MEDIUM
IMPORTANT

When lead storage battery discharged, then

MEDIUM
IMPORTANT

During the charging of a lead-acid cell 

MEDIUM
IMPORTANT

While charging the lead storage battery ______.

EASY
IMPORTANT

A lead storage battery consists of a lead anode and a grid of lead packed with lead dioxide as the cathode. The electrolyte taken is 39% H2SO4 by mass having a density of 1.29gmL-1. The battery holds 3.5 L of the acid. During the discharge of the battery, the densityH2SO4 falls from1.294gmL-1 to 1.139gmL-1 which is 20%H2SO4 by mass.

Moles of sulphuric acid lost during discharge is: 

MEDIUM
IMPORTANT

The emf of lead storage battery is ......V.

EASY
IMPORTANT

Write the chemistry of recharging the lead storage battery, highlighting all the materials that are involved during recharging.