Now Rancho started opening up batteries in different objects. He opened battery of his watch now. After opening it up, he made some observations. Which of the following observations of Rancho are TRUE?

It is a Zn – Carbon dry cell.

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It consists of zinc container as the anode.

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It consists of a carbon rod as the cathode.

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Moist mercuric oxide with KOH is filled between the two electrodes.

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Solution

The correct options are
B It consists of zinc container as the anode.
C It consists of a carbon rod as the cathode.
D Moist mercuric oxide with KOH is filled between the two electrodes.
As we saw in the hint, mercury cell is used in small electrical devices.
So, when Rancho opened the battery inside his watch it was a mercury cell.
Now, what do we know about mercury cell. Let’s recall it.
It consists of zinc container as the anode, a carbon rod as the cathode, and moist mercuric oxide mixed with KOH as the electrolyte filled between the two electrodes. A lining of porous paper keeps the electrolyte separated from the zinc anode.

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