In this question, we need to match the cells listed in List-I with their corresponding uses, properties, or reactions from List-II. Let's analyze each one:
A. Leclanche cell - IV. Reaction at anode Zn → Zn2+ + 2e- The Leclanche cell is a type of primary battery that uses zinc as the anode. In this cell, the anodic reaction involves the oxidation of zinc: \(Zn \rightarrow Zn^{2+} + 2e^-\)\), which matches with option IV.
B. Ni-Cd cell - III. Rechargeable The Nickel-Cadmium (Ni-Cd) cell is known for its rechargeable property. It can be cycled many times by recharging, matching option III.
C. Fuel cell - I. Converts energy of combustion into electrical energy Fuel cells convert the chemical energy from fuel into electricity through a chemical reaction with oxygen or another oxidizing agent. Thus, they perfectly describe option I.
D. Mercury cell - II. Does not involve any ion in solution and is used in hearing aids Mercury cells typically do not involve any ions in the solution due to their construction and chemistry. They are used in small devices like hearing aids, aligning with option II.
Therefore, the correct answer is A-IV, B-III, C-I, D-II, which matches each cell type from List-I with the correct description or use from List-II.
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Approach Solution -2
A. Leclanche Cell: This is a primary cell where the reaction at the anode is: \[ \text{Zn} \rightarrow \text{Zn}^{2+} + 2e^- \] Thus, it matches IV. B. Ni-Cd Cell: The nickel-cadmium cell is a rechargeable secondary cell commonly used in portable devices. Thus, it matches III. C. Fuel Cell: Fuel cells convert the energy of combustion (e.g., hydrogen and oxygen) into electrical energy. Thus, it matches I. D. Mercury Cell: Mercury cells are small, primary cells commonly used in hearing aids, and they do not involve any ion in solution.Thus, it matches II. Final Match: A-IV, B-III, C-I, D-II.
