Question

10. Greenish-blue colour appears at which electrode when current is passed through a potato?

a) Anode

b) cathode

c) No colourisation occurs

d) At both electrodes
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Answer 1

Answer:

This is the reason of greenish spots in potato on passing current through it. It alwasy appear on the around the copperw wire connected to the positive terminal of the battery. This is an example that electricity causes chemical reaction. This chemical reaction causes colour change.