4. Which of the following assertions about a main cell is correct? a) An example of a primary cell is a mercury cell b) An example of a primary cell is a nickel-cadmium storage cell c) The electrode reactions can be reversed d) It can be recharged
Answer: a Explanation: A primary cell is one in which the electrode reactions only happen once and cannot be reversed with electrical energy. As a result, primary cells are unable to be recharged. A main cell, such as a mercury cell, is different from a secondary cell, such as a nickel-cadmium storage cell.
