Question

Which of the following substances will release ${\text{H}}^{+}$ ions when dissolved in water?

• A. $\text{HCl}$
• B. $\text{NaCl}$
• C. $\text{NaOH}$
• D. ${\text{H}}_2{\text{SO}}_4$

Answer 1

Answer: (A), (D)

The correct options are
A $\text{HCl}$
D ${\text{H}}_2{\text{SO}}_4$

Arrhenius acids release ${\text{H}}^{+}$ ions when dissolved in water. Among the options, hydrochloric acid ($\text{HCl}$) and sulphuric acid (${\text{H}}_2{\text{SO}}_4$) are arrhenius acids.
Sodium chloride ($\text{NaCl}$) is a salt that dissociate into ${\text{Na}}^{+}$ and ${\text{Cl}}^{-}$ ions when dissolved in water.
Also, sodium hydroxide ($\text{NaOH}$) is an Arrhenius base as it dissociate in water to form ${\text{OH}}^{-}$ ions.