Alkaline earth metal oxides react with water to give hydroxides. The solubility of alkaline earth metal oxides in water increases as we move from top to bottom in a group. Which of the following alkaline earth metal oxides is least soluble in water?
Correct answer: A. MgO
- A. MgO
- B. CaO
- C. BaO
- D. SrO
Explanation
Solubility of alkaline earth metal oxides in water increases as we move from top to bottom because lattice energy decreases faster than hydration energy. For the compound to be soluble, its hydration energy must be greater than its lattice energy. Mg is at the top of the group (followed by Ca, Sr, and then Ba), Magnesium oxide (MgO) has low solubility in water. It reacts with water to form magnesium hydroxide Mg(OH)2, but the solubility is relatively limited.
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The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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