Electrolysis and Storage Batteries
In a battery cover is placed over the element and sealed to the top of the battery container. This is done

None of the listed here
to reduce evaporation of water from electrolyte
Both of the listed here
to exclude dirt and foreign matter from the electrolyte

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Electrolysis and Storage Batteries
In a lead-acid cell, if the specific gravity of sulphuric acid is 1.8, it will require following ratio of acid to water to get mixture of specific gravity of 1.3

4 parts of acid to 4 parts of water
6 parts of acid to 4 parts of water
4 parts of acid to 8 parts of water
4 parts of acid to 6 parts of water

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