Question

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

• A. Oxide ion accepts sharing in a pair of electrons
• B. Oxide ion donates a pair of electrons
• C. Oxidation number of oxygen increases
• D. Oxidation number of sodium decreases

Answer 1

Answer: (B)

Oxide ion donates a pair of electrons

Answer 2

O2– (base) + H2O (acid) $\longrightarrow$OH– (C.B) + OH– (C.A.)

O2– acts as Lewis base.