The formula of hydroxyl ion is:

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None of the above

answer is B.

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Detailed Solution

Concept- Hydroxyl ion is formed along with hydronium ions as a result of dissociation of water molecules.
The dissociation of water molecules can be shown as-

{2 H}_{2} O \to H_{3} O^{+} + O H^{-}

The hydroxyl ion is

{OH}^{-}

and the hydronium ion is

H_{3} O^{+}

. Hydroxyl ion is also called hydroxide ion.It consists of a hydrogen and an oxygen atom held together by a covalent bond. Hydrogen carries a negative electrical charge.
Hence, the correct answer is 2.

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