passive
active
redundant
inert
Answer is Right!
Answer is Wrong!
The correct answer is active.
Active materials are the substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging.
Passive materials are the substances of the cell which do not take active part in chemical combination but are used to support the active materials.
Redundant materials are the substances of the cell which are not essential for the cell to function but are used to improve the performance of the cell.
Inert materials are the substances of the cell which do not take part in any chemical reaction and are used to provide structural support to the cell.