Question

The characteristic properties of an acid is due to the presence of ___________.

• A. hydride ions
• B. hydroxyl ions
• C. hydronium ions
• D. oxide ions

Answer 1

Answer: (C)

hydronium ions

Acid in aqueous solution gives $H^{+}$ ion which combines with water to form hydronium ions ($H_3{O}^{+}$). Hence, acid is characterised by the presence of hydronium ions. Equation is as follows:

$H^{+}+H_{2}O\left(aq\right)\to H_3{O}^{+}\left(aq\right)$