Question

Which of the following is not a strong electrolyte ?

• A. Fused NaCl
• B. Acetic acid
• C. Dilute perchloric acid
• D. Aqueous NaOH solution

Answer 1

The correct option is B Acetic acid

A strong electrolyte is a solution/solute that completely ionizes or dissociates in a solution. These ions are good conductors of electric current in the solution.

• Fused or molten NaCl (liquid phase) containing mobile $N{a}^{+}$ $C{l}^{-}$ ions (charge carriers).Thus it is a strong electrolyte and good conductor of electricity.
• Acetic acid $\left(C{H}_{3}COOH\right)$ is a weak electrolyte because it doesn't dissociate completely.
• All ionic compounds are strong electrolytes, because they mostly break up into ions as they dissolve in water. Dilute Percholric acid $\left(HCl{O}_4\right)$ and $NaOH$ both are strong acid and base respectively. They will completely dissociate into ions and they are called strong electrolytes.