A depolariser used in dry cell batteries is:

ammonium chloride

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manganese dioxide

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potassuim hydroxide

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sodium phosphate

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Solution

The correct option is B manganese dioxide
The battery contains a conducting solution (electrolyte) of ammonium chloride, a cathode (positive terminal) of carbon, a depolarizer of manganese dioxide (oxidizer) which changes its oxidation state or partakes in a formation or breaking of chemical bonds.

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