decrease the output e.m.f.

increase the output e.m.f.

decrease the internal resistance

increase the current capacity

it converts the produced hydrogen into water

it prevents the fast chemical action on the zinc electrode

it synthesizes the decomposed electrolyte

it absorbs the oxygen produced in the cell

Manganese oxide

Zinc chloride

Ammonium chloride

Carbon powder

can be used in portable equipments

can be recharged

is compact and hence easy to transport

cannot be recharged

it has a standard shape

it is dry

it is rechargeable

it is easily manufactured