Which is incorrectly matched?

Options

A. Anionic surfactant `- C_(17)H_(35)COONa`
B. Cationic surfactant
C. Erionite `-Na_(2)K_(2)CaMg(AlO_(2))_(2)(SiO_(2))_(2)6H_(2)O`
D. None of these

Answer

To determine which option is incorrectly matched, we will analyze each option provided in the question regarding surface chemistry concepts.

### Step-by-Step Solution:

1. **Identify the First Option: Anionic Surfactant**
- Anionic surfactants are negatively charged surfactants. They have a hydrophilic (water-attracting) end that carries a negative charge.
- The example given is C₁₇H₃₅COO⁻Na⁺, which represents the stearate ion (C₁₇H₃₅COO⁻). The negative charge indicates that this is indeed an anionic surfactant.
- **Conclusion:** This option is correctly matched.

2. **Identify the Second Option: Cationic Surfactant**
- Cationic surfactants are positively charged surfactants. They are often quaternary ammonium compounds.
- The example provided is C₁₆H₃₃N⁺Cl⁻, which indicates a quaternary ammonium compound. This confirms that it is a cationic surfactant.
- **Conclusion:** This option is correctly matched.

3. **Identify the Third Option: Areonite**
- Areonite is a naturally occurring fibrous mineral that belongs to the group of hydrated aluminosilicates, also known as zeolites.
- The molecular formula given in the question is Na₂K₂CaMgAlO₂·SiO₂·6H₂O. Upon comparison with the known formula of areonite, which is Na₂K₂CaMgAl₉Si₂₇O₇₂·27H₂O, we find that the provided formula is incorrect.
- **Conclusion:** This option is incorrectly matched.

4. **Final Conclusion:**
- The incorrect match is option 3, Areonite, due to the discrepancy in the molecular formula.

### Final Answer:
The incorrectly matched option is **Option 3: Areonite**.

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