Question

Though $HCl$ and $N{H}_3$ are covalent molecules, their aqueous solutions conduct electricity, and this is due to

• A. The presence of free electrons
• B. The formation of free ions
• C. The formation of hydrated compounds
• D. Formation of a dative bond

Answer 1

The correct option is B

The formation of free ions

Explanation for Correct option :B)

The formation of free ions.

$HCl$ and $N{H}_3$ molecules when dissolved in water or in aqueous solutions, they form free ions like $H_3{O}^{+}\&N{H_4}^{+}$ and possess dative bonds in them. Due to these ions, they conduct electricity.

Explanation Incorrect options:

A)The presence of free electrons- is a wrong statement as there are no free electrons in $HCl$and $N{H}_3$

C)The formation of hydrated compounds - is a wrong statement because, hydrated ions can be formed but not hydrated compounds.
D) Formation of a dative bond - s a wrong statement as formation of dative bond does not cause conduction of electricity.

Hence, B) is the correct option- $HCl$and $N{H}_3$ molecules though they are covalent but conduct electricity due to the presence of free ions.