`{:(,"List-I",,"List-II",),(,"Type of ionic compound",,,),((P),"NaCI type",(1),"Cation at 50% of tetrahedral void",),((Q),"ZnS type",(2),"Cation at 100% of tetrahedral void",),((R),"CsCI type",(3),"Cation at cubic void",),((S) ,Na_(2)O "type",(4),"Cation at 100% octahedral void",):}`

Options

A. `{:(P,Q,R,S),(4,1,3,2):}`
B. `{:(P,Q,R,S),(2,1,4,1):}`
C. `{:(P,Q,R,S),(1,2,3,4):}`
D. `{:(P,Q,R,S),(4,3,4,2):}`

Answer

To solve the problem, we need to match the types of ionic compounds listed in List-I with the corresponding positions of their cations in the lattice from List-II. Let's break down the information step by step.

### Step 1: Analyze the given types of ionic compounds in List-I

1. **P: NaCl type**
- In NaCl type structure, cations are located in octahedral voids.

2. **Q: ZnS type**
- In ZnS type structure, cations (Zn²⁺) occupy 50% of the tetrahedral voids.

3. **R: CsCl type**
- In CsCl type structure, cations (Cs⁺) are found in cubic voids.

4. **S: Na₂O type**
- In Na₂O type structure, cations (Na⁺) occupy 100% of the tetrahedral voids.

### Step 2: Analyze the positions of cations in List-II

1. **(1) Cation at 50% of tetrahedral void**
- This corresponds to Q: ZnS type.

2. **(2) Cation at 100% of tetrahedral void**
- This corresponds to S: Na₂O type.

3. **(3) Cation at cubic void**
- This corresponds to R: CsCl type.

4. **(4) Cation at 100% octahedral void**
- This corresponds to P: NaCl type.

### Step 3: Match the items from List-I with List-II

- **P (NaCl type)** matches with **(4)** (Cation at 100% octahedral void).
- **Q (ZnS type)** matches with **(1)** (Cation at 50% of tetrahedral void).
- **R (CsCl type)** matches with **(3)** (Cation at cubic void).
- **S (Na₂O type)** matches with **(2)** (Cation at 100% tetrahedral void).

### Final Matching

- P → 4
- Q → 1
- R → 3
- S → 2

### Conclusion

The correct answer is:
- P → 4
- Q → 1
- R → 3
- S → 2