Which of the following primary cells has the highest voltage ?

Manganese-alkaline
Carbon-zinc
Lithium
Mercury

The correct answer is: C. Lithium

A primary cell is a type of battery that cannot be recharged. It uses a chemical reaction to produce electricity. The voltage of a primary cell is determined by the type of chemicals used in the reaction.

Lithium cells have the highest voltage of any primary cell. They can produce up to 3 volts of electricity. This makes them ideal for use in devices that require a lot of power, such as cameras and flashlights.

Manganese-alkaline cells are the most common type of primary cell. They produce about 1.5 volts of electricity. Carbon-zinc cells produce about 1.2 volts of electricity. Mercury cells produce about 1.35 volts of electricity.

Lithium cells are more expensive than other types of primary cells, but they have a longer life span. They can also be used in a wider range of temperatures.