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| A few other common cells will now be outlined. |
| Miniature flat and round cells, capable of delivering 1.5 V, are used in calculators, hearing aids etc. In the alkaline manganese cell, zinc is the anode, a mixture of MnO2 and graphite is the cathode and the electrolyte is a solution of KOH contained in an absorbent material. The overall cell reaction is : |
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Zn( s) + 2MnO2 (s) + H2O  ZnO + H2O + 2 MnO (OH) |
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The silver oxide-Zn cell, though costlier, lasts for a longer time. Here the anode is Zn, cathode is Ag2O and the electrolyte is the KOH (aq). The cell reaction is: |
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Zn + AgO + H2O
ZnO + H2O + Ag |
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