When an electric current is passed through a cut potato for a considerable time, a coloured spot is formed around one of the electrodes :
(a) What is the colour of the spot?
(b) Around which electrode (positive or negative electrode) the coloured spot is formed?
(c) Which effect of electric current is involved in this case?

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Solution

(a) Greenish blue
(b) Around positive electrode
Due to the formation of copper ions, there is the formation of a greenish-blue spot around the copper (positive) electrode.
(c) Chemical effect
In potato, the chemical effect of the electric current is observed. When an electric current is passed through the potato chemical reaction takes place inside the potato.

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