Question

NaCl solution is neutral. If it undergoes electrolysis, pH of the solution:
1. increases
2. decreases
3. remains constant

Answer 1

NaCl is a salt of strong acid and strong base.
Its electrolysis reaction is as follows:

$2NaCl\left(aq\right)+2H_{2}O\left(l\right)\to 2N{a}^{+}\left(aq\right)+2O{H}^{-}\left(aq\right)+H_2\left(g\right)+C{l}_{@}\left(g\right)$
As $O{H}^{-}$ is produced, the pH of solution increases.