When two copper wires are planted in a potato and connected to a battery, why greenish blue spot is found only around the wire connected to the positive terminal?

Copper gets electroplated.

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Copper reacts with air.

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Potato gets rotten by the heat.

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Starch reacts with air.

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Solution

The correct option is B Copper reacts with air.
The copper wires inserted in the potato act as electrodes. Thus, one of these copper rods act as the anode, and loses electrons. thus forming copper ions. These copper ions react with air to
form an oxide of copper which is seen as a green spot on the potato.

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