Question

What is the best description of the change that occurs when $N{a}_{2}O(s)$ 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)

$O^{2-}\left(base\right)+H_{2}O\left(acid\right)\to O{H}^{-}\left(C.B\right)+O{H}^{-}\left(C.A.\right)$
$O{2}^{-}$ acts as Lewis base.