Question

Match List-I with List-II.

	List - I		List - II
(a)	Li	(i)	Absorbent for carbon dioxide
(b)	Na	(ii)	Electrochemical cells
(c)	KOH	(iii)	Coolant in fast breeder reactors
(d)	Cs	(iv)	Photoelectric cell

Choose the correct answer from the options given below:

• A. (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
• B. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
• C. (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
• D. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
This question requires knowledge of the practical applications of alkali metals and their compounds.
Step 2: Detailed Explanation:
1. (a) Lithium (Li): Due to its very low reduction potential and light weight, it is extensively used in high-energy density **electrochemical cells** (batteries). $\rightarrow$ (ii)
2. (b) Sodium (Na): Liquid sodium has high thermal conductivity and is used as a **coolant in fast breeder nuclear reactors**. $\rightarrow$ (iii)
3. (c) Potassium Hydroxide (KOH): It reacts with $CO_2$ to form $K_2CO_3$, making it an excellent **absorbent for carbon dioxide**. $\rightarrow$ (i)
4. (d) Cesium (Cs): It has a very low ionization enthalpy, allowing it to emit electrons easily when exposed to light. Hence, it is used in **photoelectric cells**. $\rightarrow$ (iv)
Step 3: Final Answer:
The correct matching is (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv).