Step 1 (Conceptual Identification): [0.5 Mark]
To solve this, we identify the primary application of each electrochemical cell based on NCERT Chemistry Class 12, Chapter 3 (Electrochemistry):
- Lead storage cell: Commonly used in automobiles and inverters for high current discharge.
- Mercury cell: Compact size makes it ideal for low-current devices like wrist watches and hearing aids.
- Dry cell (Leclanché cell): The standard portable power source for wall clocks and torches.
- Fuel cell: High efficiency and water byproduct make it suitable for the Apollo Space Programme.
Step 2 (Mapping and Verification): [0.25 Mark]
Matching the identified uses to the provided columns:
- i (Lead storage cell) $\rightarrow$ d (Inverter)
- ii (Mercury cell) $\rightarrow$ c (Wrist watch)
- iii (Dry cell) $\rightarrow$ a (Wall clock)
- iv (Fuel cell) $\rightarrow$ b (Apollo Space Programme)
Step 3 (Final Concluded Answer): [0.25 Mark]
Comparing the mapping (i-d, ii-c, iii-a, iv-b) with the given options, the correct choice is (B).
Final Answer: (B) i-d, ii-c, iii-a, iv-b
💡 EL10 Concept Insight: Think of these cells like different types of vehicles: you wouldn't use a massive truck (Lead storage) to power a tiny watch, and you wouldn't use a tiny watch battery to power a space shuttle; each cell is designed specifically for the amount of energy and the size of the device it needs to run!