Chapter 19, Problem 125A

Interpretation Introduction

Interpretation : The compound that is not an electrolyte is to be identified.

Concept Introduction : An electrolyte is a substance that, when it's molten or in an aqueous solution, conducts an electric current.

Answer to Problem 125A

Correct answer: Option (C)

The compound that is not an electrolyte is ${\text{SiO}}_{\text{2}}$ .

Explanation of Solution

Reason for correct option:

  ${\text{SiO}}_{\text{2}}$ is a nonelectrolyte compound.

If a substance doesn't conduct electricity while it is liquid or molten, it is said to as a nonelectrolyte.

The compounds that are molecular in nature are not composed of ions.

  ${\text{SiO}}_{\text{2}}$ is covalent in nature.

It exhibits a giant framework.

So, the correct option is C.

Conclusion

Reasons for incorrect options:

Option (A): $\text{NaCl}\left(l\right)$ is a strong electrolyte. The electrolytes are said to be strong if all the solutes exist as ions.

Option (B): ${\text{KNO}}_2\left(aq\right)$ is also a strong electrolyte.

Option (D): $\text{NaCl}\left(aq\right)$ is an electrolyte since there is a formation of ions in the solution.