Fill in the blanks by choosing the appropriate option. The noble gases can form compounds with (i) and (ii) . The mixture of (iii) and (iv) is used for respiration by divers.

Options

A. `{:("(i)","(ii)","(iii)","(iv)"),("iodine","oxygen","oxygen","argon"):}`
B. `{:("(i)","(ii)","(iii)","(iv)"),("fluorine","oxygen","helium","oxygen"):}`
C. `{:("(i)","(ii)","(iii)","(iv)"),("xenon","platinum","argon","krypton"):}`
D. `{:("(i)","(ii)","(iii)","(iv)"),("helium","oxygen","xenon","argon"):}`

Answer

To solve the question, we need to fill in the blanks with the appropriate options based on our knowledge of noble gases and their compounds, as well as the gases used for respiration by divers.

### Step-by-Step Solution:

1. **Understanding Noble Gases**:
- Noble gases are known for their lack of reactivity due to having a full valence shell. However, they can form compounds under certain conditions, particularly with highly electronegative elements.

**Hint**: Recall that noble gases are generally inert but can react with very electronegative elements.

2. **Identifying the Elements**:
- The most electronegative elements that noble gases can form compounds with are **fluorine (F)** and **oxygen (O)**.
- Therefore, for the first two blanks:
- (i) = **Fluorine**
- (ii) = **Oxygen**

**Hint**: Think about which elements have high electronegativity and can attract electrons from noble gases.

3. **Understanding the Mixture for Divers**:
- Divers use a specific gas mixture for respiration. The primary gas needed for respiration is **oxygen (O2)**. To reduce the risk of nitrogen narcosis and to manage the solubility of oxygen, **helium (He)** is often used in combination with oxygen.

**Hint**: Consider the gases that are safe and effective for breathing underwater.

4. **Identifying the Gases for Divers**:
- Therefore, for the next two blanks:
- (iii) = **Helium**
- (iv) = **Oxygen**

**Hint**: Remember that helium is used to make breathing easier and safer for divers at depth.

5. **Finalizing the Answers**:
- The completed sentences will be:
- The noble gases can form compounds with **(i) Fluorine** and **(ii) Oxygen**.
- The mixture of **(iii) Helium** and **(iv) Oxygen** is used for respiration by divers.

### Final Answer:
- (i) Fluorine
- (ii) Oxygen
- (iii) Helium
- (iv) Oxygen