The hydride ion H- is stronger base than its hydroxide ion OH-. Which of the following reaction will occur if sodium hydride is dissolved in water:
Correct answer: B. H-(aq) + H2O → OH- + H2
- A. H-(aq) + H2O → H3O+
- B. H-(aq) + H2O → OH- + H2
- C. H- + H2O→ H2 + O2
- D. H- + H2O → No reaction
Explanation
When sodium hydride (NaH) is dissolved in water, the hydride ion (H-) being a stronger base than hydroxide ion (OH-) reacts with water to form hydroxide ion and hydrogen gas. The correct reaction is: H-(aq) + H2O → OH- + H2. Option A is incorrect as it does not form hydronium ions. Option C is incorrect as oxygen is not formed in this reaction. Option D is incorrect as a reaction does occur when a base like hydride ion reacts with water.
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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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