Question

Which of the following is a secondary cell?
(A) Dry cell
(B) Leclanche cell
(C) Mercury cell
(D) None of these

Answer 1

Hint: First we should know what a secondary cell is? So a secondary cell is a type of electrical battery which can be recharged. The energy density in secondary cells is low and it has a low internal resistance.

Complete step by step solution:
Cells or batteries are generally classified into two types – primary cell and the secondary cell.
Primary cells or batteries can be used only once which means that they cannot be recharged. These cells cannot be recharged because the reactions at the electrodes happen only once and over a period of time the cell becomes dead and of no use.
Secondary cells or batteries can be recharged which means that they can be used again. The chemical reactions in secondary cells are reversible. Secondary cells can supply both weak and high currents where the primary call can only supply weak current.
The dry cell is basically a type of battery which is used in the portable electronic device, it cannot be recharged hence it is a primary battery.
Leclanche cell is generally used in electric bells, we can say that it is basically an early version of a dry cell and it cannot be recharged hence it is a primary cell.
Mercury cell or battery is also non-rechargeable, it is generally used in small devices like watches, calculators etc.

Hence the correct answer for this question is D (none of these).

Note: Some of the common examples of secondary cells or batteries are Nickel-cadmium batteries or lead-acid batteries and lithium-ion batteries etc. The reaction in a secondary battery occurs several times and once it is discharged it is again reached by passing the current in the opposite direction.