Deminerakised `H_(2)O` is obtained when

Options

A. Water is passed through `R-SO_(3)`H resin
B. Water is passed through `R-overset(+)NH_(3)Ooverset(Theta)H` resin
C. Water is passed through both `RSO_(3)H` resin and `R" "overset(o+)NH_(3)OoversetTheta(H)` resin
D. We can't get demineralised `H_(2)O` artificially by resins

Answer

To obtain demineralized water (H₂O), we need to remove the dissolved salts, which consist of cations and anions, from mineralized water. The process involves two main steps: cation exchange and anion exchange.

### Step-by-Step Solution:

1. **Understanding Mineralized Water**:
- Mineralized water contains dissolved salts, which dissociate into cations (positively charged ions) and anions (negatively charged ions).

2. **Cation Exchange Process**:
- The first step in obtaining demineralized water is to pass the mineralized water through a **cation exchange resin**.
- This resin typically contains sulfonic acid groups that facilitate the exchange of cations in the water with hydrogen ions (H⁺).
- As the mineralized water passes through this resin, the cations in the water are replaced by H⁺ ions.

3. **Anion Exchange Process**:
- After the cation exchange, the resulting solution (which now contains H⁺ ions) is then passed through an **anion exchange resin**.
- This resin is usually made of ammonium hydroxide, which facilitates the exchange of anions in the water with hydroxide ions (OH⁻).
- As the solution passes through this resin, the anions are replaced by OH⁻ ions.

4. **Formation of Demineralized Water**:
- The combination of H⁺ ions from the cation exchange and OH⁻ ions from the anion exchange results in the formation of water (H₂O).
- Thus, after both processes, we obtain demineralized water, which is free from cations and anions.

5. **Conclusion**:
- Therefore, the correct answer to the question is that demineralized H₂O is obtained when water is passed through both the sulfonic acid region (for cation exchange) and the ammonium hydroxide region (for anion exchange).

### Final Answer:
Demineralized H₂O is obtained when water is passed through both the sulfonic acid region and the ammonium hydroxide region (Option 3).

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