JEE Main 2025 · 29 January · evening · Single correct · +4 / −1
Match List - I with List - II :
Choose the correct answer from the options given below :
| List - I (Applications) | List - II (Batteries/Cell) |
|---|---|
| (A) Transistors | (I) Anode - Zn/Hg; Cathode - HgO + C |
| (B) Hearing aids | (II) Hydrogen fuel cell |
| (C) Inverters | (III) Anode - Zn; Cathode - Carbon |
| (D) Apollo space ship | (IV) Anode - Pb; Cathode - Pb | PbO₂ |
- (a) (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
- (b) (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
- (c) (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
- (d) (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
Answer and solution
Answer (a) (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
Solution
Chemistry ma’am · 2 steps
Think of where each cell sits in real life: torch-cell, button cell, car battery, space fuel cell.
- Identify each cell. Zn anode with a carbon cathode is the dry (Leclanché) cell. Zn/Hg amalgam with HgO and carbon is the mercury cell. Pb with PbO₂ is the lead storage battery.
Application Cell used Why it fits (A) Transistors (III) Dry cell: Zn anode, carbon cathode Cheap, small, steady low current (B) Hearing aids (I) Mercury cell: Zn/Hg anode, HgO + C cathode Tiny button cell with a constant voltage of about 1.35 V (C) Inverters (IV) Lead storage battery: Pb anode, PbO₂ cathode Rechargeable, delivers large current (D) Apollo space ship (II) H₂–O₂ fuel cell Gives power and drinking water for the crew - So. The matching is (A)-(III), (B)-(I), (C)-(IV), (D)-(II), which is option (a).
The idea to keep. Link each cell to one famous use: dry cell in torches and transistors, mercury cell in hearing aids and watches, lead battery in cars and inverters, fuel cell in Apollo.
Answer from the NTA final answer key. Solution by PrepWiser.