Question

When an electric current is passed through a cut potato for a considerable time, greenish blue spot is formed around positive electrode. The chemical effect of the electric current is involved in this process.

Answer 1

Answer:

In potato, chemical effect of the electric current is observed. When electric current is passed through potato chemical reaction takes place inside potato.

Copper and zinc is connected with potato which acts as electrode. Here, redox reaction takes place between two metals.

Due to formation of copper ions, there is formation of greenish blue spot around copper (positive) electrode.

When the potato is completely rot, then there is no electrical effect in it.

The electrochemical reaction is given in the equation below:

Cu(s) +Zn +2⟶Cu2+ +Zn(s)