dilute sulphuric acid
concentrated sulphuric acid
NaOH
kOH
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Electrolysis and storage of batteries
82. In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following
One part H2O, three parts H2SO4
Two parts H2O, two parts H2SO4
Three parts H2O, one part H2SO4
All H2SO4
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83. The e.m.f. of an Edison cell, when fully charged, is nearly
1.4 V
1 V
0.9 V
0.8 V
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Answer is Wrong!
Detailed SolutionThe e.m.f. of an Edison cell, when fully charged, is nearly
84. The active materials on the positive and negative plates of a fully charged lead-acid battery are
lead and lead peroxide
lead sulphate and lead
lead peroxide and lead
none of the above
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85. Charging a sulphated battery at high rate results in
boiling of electrolyte due to gassing
warping of plates
damage to separators, cell caps covers and battery case due to excessive temperature
all above
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Detailed SolutionCharging a sulphated battery at high rate results in
86. Dry cell is modification of
Deniell cell
Leclanche cell
Lead-acid cell
Edison cell
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87. Ampere hour capacity of an industrial battery is based on ____ hours discharge rate.
8
12
16
24
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88. The storage battery generally used in electric power station is
nickel-cadmium battery
zinc-carbon battery
lead-acid battery
none of the above
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Detailed SolutionThe storage battery generally used in electric power station is
89. As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of
reducing time of charging
increasing cell capacity
both (A) and (B)
avoiding excessive gassing
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90. When two batteries are connected in parallel, it should be ensured that
they have same e.m.f.
they have same make
they have same ampere-hour capacity
they have identical internal resistance
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Detailed SolutionWhen two batteries are connected in parallel, it should be ensured that