Arrange the below given cells/batteries into following order:-
Dry Cell; battery commonly used in watches; battery has longer life but more expensive to manufacture and battery commonly used in automobiles but comparatively less expensive.
A. Nickel-cadmium cell
B. Mercury cell
C. Leclanche cell
D. Lead storage battery
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → C, B, A, D
Commercial cells are chosen by their use and cost. Each description in the question points to one cell:
Dry cell (first place): C, the Leclanche cell. It has a zinc container as anode and a carbon (graphite) rod as cathode, and is used in transistors, clocks and torches.
Battery used in watches (second place): B, the mercury cell. It is small and gives a constant potential of about 1.35 V, so it suits watches and hearing aids.
Longer life but more expensive (third place): A, the nickel–cadmium cell. It is rechargeable and lasts longer than the lead storage cell, but is more expensive to manufacture.
Used in automobiles, less expensive (fourth place): D, the lead storage battery. It is rechargeable and cheaper, and is used in automobiles and inverters.
Shortcut: The dry cell is the Leclanche cell (C), which leaves Options (2), (3) and (4). The watch battery is the mercury cell (B), and only Option (4) has B second.