The question asks to identify the primary cell commonly used in small electronic devices. We need to evaluate each option based on its typical applications and characteristics.
Correct Option: B) Alkaline cell — Alkaline cells are primary (non-rechargeable) batteries that offer good energy density and a long shelf life, making them ideal for powering a wide range of small electronic devices such as remote controls, flashlights, toys, and portable audio equipment.
The question asks to identify the electrolyte used in a zinc-carbon cell. This requires knowledge of the basic components and chemistry of this type of primary (non-rechargeable) battery.
Correct Option: B) Ammonium chloride is the primary electrolyte used in a zinc-carbon cell, typically in a paste form along with zinc chloride.
The question asks about the typical disposal practice for primary cells. Understanding the fundamental difference between primary and secondary cells is key to answering this question.
Correct Option: B) Discharge
Primary cells are non-rechargeable batteries. Once their chemical energy is converted into electrical energy and the reactants are consumed, they are considered discharged and are typically discarded because their internal chemical processes are irreversible.
This question asks for the standard voltage of an alkaline cell. This is a factual recall question related to basic electronics and electrochemistry. We need to know the typical open-circuit voltage produced by a single alkaline battery cell.
Correct Option: B) 1.5V
The question asks about the typical form of the electrolyte in a dry cell. We need to recall the basic construction and characteristics of a dry cell, particularly how it differs from a wet cell, to determine the state of its electrolyte.
B) Paste. In a dry cell, the electrolyte is typically in the form of a moist paste. This paste allows for the necessary chemical reactions and ion flow while preventing the electrolyte from spilling, making the battery portable and safer to use than cells with liquid electrolytes.
The question asks to identify the component that acts as the cathode in a zinc-carbon cell. To answer this, we need to recall the basic construction and electrochemical reactions within a standard zinc-carbon dry cell.
Correct Option: B) Carbon rod acts as the cathode in a zinc-carbon cell, facilitating the reduction reaction.