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?

(a) The spot color is Greenish blue.

(b) The coloured spot is formed around the positive electrode.

(c) This is known as Chemical effect.