Question

Which of the following salts is a strong electrolyte?

• A. $NaCl$
• B. $KCl$
• C. $MgC{l}_2$
• D. All of the above

Answer 1

Answer: (D)

All of the above

$NaCl$ when dissolved in water completely dissociates into the ions $N{a}^{+}$ and $C{l}^{-}$.
When $KCl$ is dissolved in water it completely dissociates into the ions $K^{+}$ and $C{l}^{-}$.
And when $MgC{l}_2$ is dissolved in water it undergoes complete dissociation into one dipositive ion $M{g}^{2+}$ and two uni-negative ions $C{l}^{-}$.
Thus, it is seen that all the above mentioned salts undergo complete dissociation into ions when they are dissolved in water.
Hence all the above mentioned salts are strong electrolytes.