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
Both of the listed here
to reduce evaporation of water from electrolyte
to exclude dirt and foreign matter from the electrolyte

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Electrolysis and Storage Batteries
Life of the batteries is in the following ascending order.

Lead-acid cell, Edison cell, Nickel cadmium cell
Edison cell, Nickel-cadmium cell, lead-acid cell
Lead-acid cell, Nickel-cadmium cell, Edison cell
Nickel-cadmium cell, Edison cell, lead-acid cell

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