Question

why colour change only occur in the positive terminal of the battery​

Answer 1

Answer:

The colour of the region of potato around the wire that is connected to the positive terminal of the battery is - Bluish green. This is because the electrons from the negative terminal of the battery move inside the potato as the electrolysis occurs at the copper wire that is inside the potato

Explanation:

hope so it helped u

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Answer 2

Answer:

your answer is above in picture