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What is the best description of the change that occurs when Na2O(s) is dissolved in water ?

1. Oxide ion accepts sharing a pair of electrons
2. Oxide ion donates a pair of electrons
3. Oxidation number of oxygen increases
4. Oxidation number of sodium decreases

Correct answer: Oxide ion donates a pair of electrons

Solution

When Na2O is dissolved in water, it reacts to form hydroxide ions, where the oxide ion (O2-) donates a pair of electrons to water molecules, facilitating the formation of hydroxide ions (OH-). This electron donation is a key characteristic of the oxide ion's behavior in this reaction.

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