Match the compound(s)/metal(s) in X with their uses in Y
`{:(X,Y),(A."Liquid sodium metal",I."Breathing apparatus submarine"),(B."Potassium stearate",II."Explosive"),(C."Potassium nitrate",III."Coolant in nuclear reactor"),(D."Potassium superoxide hence correct order is",IV."Soft soap"):}`

Options

A. `{:(A,B,C,D),(I,III,II,IV):}`
B. `{:(A,B,C,D),(III,IV,II,I):}`
C. `{:(A,B,C,D),(II,I,III,IV):}`
D. `{:(A,B,C,D),(IV,II,III,I):}`

Answer

To solve the problem of matching the compounds/metal in column X with their respective uses in column Y, we will analyze each item in column X and identify its correct use from column Y.

### Step-by-Step Solution:

1. **Identify the first item in X: Liquid Sodium Metal (A)**
- Liquid sodium metal is known for its high thermal conductivity and is primarily used as a coolant in nuclear reactors.
- **Match:** A (Liquid Sodium Metal) → III (Coolant in Nuclear Reactor)

2. **Identify the second item in X: Potassium Stearate (B)**
- Potassium stearate is a potassium salt of stearic acid and is commonly used in the production of soft soap.
- **Match:** B (Potassium Stearate) → IV (Soft Soap)

3. **Identify the third item in X: Potassium Nitrate (C)**
- Potassium nitrate is a chemical compound that is widely used in fertilizers and also as an ingredient in explosives.
- **Match:** C (Potassium Nitrate) → II (Explosive)

4. **Identify the fourth item in X: Potassium Superoxide (D)**
- Potassium superoxide is used in breathing apparatus, especially in submarines, as it can absorb carbon dioxide and release oxygen.
- **Match:** D (Potassium Superoxide) → I (Breathing Apparatus Submarine)

### Final Matches:
- A → III (Liquid Sodium Metal → Coolant in Nuclear Reactor)
- B → IV (Potassium Stearate → Soft Soap)
- C → II (Potassium Nitrate → Explosive)
- D → I (Potassium Superoxide → Breathing Apparatus Submarine)

### Correct Order:
Thus, the correct order of matches is:
- A → III
- B → IV
- C → II
- D → I

### Conclusion:
The answer for the given question is option number B.

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