Question

When solid $NaCl$ is dissolved in water:

• A. ions are formed
• B. ions are formed and they become free to move
• C. ions already present become free to move
• D. ions already present combine to form molecules

Answer 1

The correct option is C ions already present become free to move

When $NaCl$ is dissolved in water, the solid NaCl dissolves and being a strong electrolyte dissociates into its ion which formed the solid.

$NaCl\left(aq\right)\to N{a}^{+}\left(aq\right)+C{l}^{-}\left(aq\right)$

The ions already present in solid separate in the aqueous solution and become free to move in the solution.