Question

Match the following

	List - 1 (Chemical)		List - 2 (Use)
A	KOH	I	Coolant
B	Na(l)	II	Antacid
C	Li	III	Electrochemical cells
D	Mg(OH)\(_2\)	IV	Absorbent for CO\(_2\)

• A. A-II, B-III, C-IV, D-I
• B. A-IV, B-I, C-III, D-II
• C. A-IV, B-III, C-II, D-I
• D. A-III, B-IV, C-I, D-II

Hint:

Identifying unique uses like "Liquid Na as coolant" or "Li in batteries" helps in elimination.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:

We match specific s-block compounds/elements to their well-known industrial or laboratory applications based on their chemical properties.
Step 2: Analysis of Pairs:

1. A. KOH (Potassium Hydroxide): It reacts with \( \text{CO}_2 \) to form potassium carbonate. It is widely used to absorb carbon dioxide. (Match: IV). 2. B. Na(l) (Liquid Sodium): It has high thermal conductivity and a wide liquid range, making it an excellent coolant for nuclear reactors. (Match: I). 3. C. Li (Lithium): Lithium has a very high negative standard reduction potential and low atomic mass, making it ideal for high-energy density electrochemical cells/batteries. (Match: III). 4. D. Mg(OH)\(_2\) (Magnesium Hydroxide): A suspension of this is "Milk of Magnesia", a weak base used to neutralize stomach acidity (Antacid). (Match: II).
Step 3: Verification:

Sequence: A-IV, B-I, C-III, D-II. This corresponds to Option (B).
Step 4: Final Answer:

The correct match is A-IV, B-I, C-III, D-II.