Question

Which of the following is(are) true when $HCl\left(g\right)$ is passed through water?
I. It does not ionise in the solution as it is a covalent compound.
II. It ionises in the solution.
III. It gives both hydrogen and hydroxyl ion in the solution.
IV. It forms hydronium ion in the solution due to the combination of hydrogen ion with the water molecule.

• A. I only
• B. III only
• C. II and IV
• D. III and IV

Answer 1

Answer: (C)

II and IV

$HCl$ is strong acid and ionises in the solution into $H^{+}$ and $O{H}^{-}$. $H^{+}$ forms $H_3{O}^{+}$ (hydronium ion) in water.