how local action defect is prevented in voltaic cell
Answers
Answer:
Local Action : This is caused by the impurities present in zinc rod. When the zinc rod isimmersed in acid, the zinc atoms and the impurity atoms form a large number of local cells and the zinc rod gets consumed even when the cell is not in use. This defect can be avoided by using amalgamated zinc rods.
Question:
How local action defect is prevented in voltaic cell?
Answer:
This is due to the impurities present in the zinc plate. The zinc plate mein contain impurities like carbon iron and lead etc. These impurities become positive electrodes and with the zinc rod as the negative electron forms tiny cells. This process reduces the main current. The zinc gets wasted in the process. This defect is called the local action of voltaic cell. This defect is prevented by using either chemically pure zinc or amalgamated zinc with mercury coating.
