Sodium hydroxide solution was added to dilute hydrochloric acid. The pH of the solution in the flask was measured at intervals until no further change of pH took place. What would be the pH change in this reaction?

The pH change will be neutral. I.e pH of 7.

Explanation:

The pH change will be neutral because reaction between hydrochloric acid and sodium hydroxide will result in the formation of sodium chloride salt and water. Sodium chloride salt and water is neutral because reaction between strong acid(pH is acidic) and strong base( pH is basic) will produce neutral salt with pH of 7. This salt does not hydrolyze.

it is the most commonly accepted one