Question

Which substance is reduced at cathode when dry cell is working?
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Answer 1

Answer:

NH3 (Ammonia) is reduced at cathode when dry cell is working. It is reduced by zinc so that ammonia not interrupt in the working of dry cell

Answer 2

Answer:

Zinc-carbon cells produce 1.5 volts. For a dry-cell battery to operate, oxidation will occur from the zinc anode and reduction will take place in the cathode.

Explanation:

From the above question,

They have given :

In a dry cell battery, the substance that is reduced at the cathode is MnO2​.

This occurs when two NH4+​ ions, two MnO2​ molecules, and two electrons combine to form Mn2​O3​, H2​O, and two NH3​ molecules.

This reaction is explained in [1], where it states:

             "2NH4+​+2MnO2​+2e−→Mn2​O3​+H2​O+2NH3​".

At the anode, zinc is oxidised to Zn2+ ions, as explained,

where it states:

              "Zn→Zn2++2e−".

This is explained further, where it states:

         "For a dry-cell battery to operate, oxidation will occur from the zinc anode and reduction will take place in the cathode."

Hence

      Zinc-carbon cells produce 1.5 volts. For a dry-cell battery to operate, oxidation will occur from the zinc anode and reduction will take place in the cathode.

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