The question asks for the definition of a primary cell. We need to understand the fundamental characteristics that distinguish primary cells from other types of electrochemical cells.
Correct Option: B) A cell that is non-rechargeable
The question asks to identify a primary cell from the given options. A primary cell is a type of battery that is designed for single use and cannot be recharged. Once the chemical reactants are consumed, the battery stops producing electricity and is discarded.
Correct Option: A) Zinc-carbon cell is a primary cell because it is designed for single use and cannot be recharged.
The question asks why the terminal voltage of a primary cell decreases over time. This phenomenon is directly related to the internal chemical processes that occur as the cell discharges.
D) Chemical depletion. As the primary cell operates, the chemical reactants that drive the electrochemical reactions are consumed. This depletion directly reduces the cell's ability to generate a consistent potential difference, leading to a decrease in its terminal voltage. The accumulation of reaction products also contributes by increasing internal resistance.
The question asks about the common application of primary cells. To answer this, we need to understand the characteristics of primary cells and how they differ from secondary cells, then match these characteristics with the power requirements of the given options.
Correct Option: A) Remote controls — Remote controls are low-power devices that are used intermittently. The convenience of disposable, non-rechargeable primary cells (like AA or AAA alkaline batteries) outweighs the need for rechargeable ones, making them the most common choice.
The question asks about the nature of the chemical reaction occurring in a primary cell. Understanding the fundamental difference between primary and secondary cells is key here.
Correct Option: B) Irreversible
The chemical reactions in a primary cell are irreversible. This means that once the reactants are consumed to produce electrical energy, the cell cannot be recharged by reversing the chemical process. Examples include dry cells (like AA, AAA batteries) and alkaline batteries.
The question asks for the primary advantage of a primary cell. We need to understand the characteristics of primary cells versus secondary cells to identify their key benefit.
A) Low cost. Primary cells are designed for single use and are typically inexpensive to produce, making them a cost-effective choice for many low-power, disposable applications.