Metal-aqua ions and their acidity Quiz
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5 questions, one answer each
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1. Which formula is the aluminium aqua ion?
- A. [Al(H₂O)₆]²⁺
- B. [Al(H₂O)₄]³⁺
- C. [Al(H₂O)₆]³⁺
- D. [Al(OH)₆]³⁺
2. What is formed when [Fe(H₂O)₆]³⁺ acts as an acid in water?
- A. [Fe(H₂O)₅(OH)]²⁺ and H₃O⁺
- B. [Fe(H₂O)₅(OH)]²⁺ and OH⁻
- C. [Fe(H₂O)₆(OH)]²⁺ and H⁺
- D. [Fe(OH)₆]³⁻ and H₃O⁺
3. Why does [Fe(H₂O)₆]³⁺ give a lower pH than [Fe(H₂O)₆]²⁺ at the same concentration?
- A. It has a lower charge/size ratio
- B. It has more water ligands
- C. It has a higher charge/size ratio, so it polarises O–H bonds more
- D. It is a Lewis base
4. A solution has pH 2.0. What is [H⁺]?
- A. 0.01 mol dm⁻³
- B. 0.2 mol dm⁻³
- C. 2.0 mol dm⁻³
- D. 1 × 10⁻¹² mol dm⁻³
5. Which bond links a water ligand to the metal ion?
- A. Ionic
- B. Hydrogen
- C. Coordinate
- D. Metallic