what is the function of MnO2 in dry cell?
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MnO2 is an electron acceptor and takes electrons from zinc metal.
Ions travel to complete flow of electrons and paste is the medium that permits the circuit to complete and prevents polarization from happening at surface of Zn electrode.
If such battery is allowed to discharge completely it can be briefly regained by letting it go to Zn ions which can diffuse through paste and depolarize electrode so it gains to gives electrons again.
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