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Q.

A student uses a potato as a cell to get electric current, and he finds some green spot on the potato when a copper wire is inserted. This green spot is [[1]].


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Detailed Solution

This green spot is a chemical reaction.
When the electric current passes through the potato, the starch in it reacts with the battery's positive terminal. As a result, it increases the negative ions present in the potato and makes a compound of copper which is bluish-green in colour.
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