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Electrolysis and Storage Batteries

Electrolysis and Storage Batteries
Which of the following cell has a reversible chemical reaction ?

Mercury oxide
Carbon-zinc
Silver-oxide
Lead-acid

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Electrolysis and Storage Batteries
Level of electrolyte in a cell should be _____ the level of plates

below
none of the listed here
equal to
above

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Electrolysis and Storage Batteries
During the charging and discharging of a nickel-iron cell

corrosive fumes are produced
nickel hydroxide remains unsplit
water is neither formed nor absorbed
its e.m.f. remains constant

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Electrolysis and Storage Batteries
During the charging of a lead-acid cell

its voltage increases
specific gravity of H₂SO₄ decreases
it gives out energy
its cathode becomes dark chocolate brown in colour

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Electrolysis and Storage Batteries
Satellite power requirement is provided through

dry cells
solar cells
lead-acid batteries
nickel-cadmium cells

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Electrolysis and Storage Batteries
The effect of sulphation is that the internal resistance

remains same
increases
none of the listed here
decreases

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