The graph given below depicts a neutralization reaction (acid + alkali → salt + water). The pH of a solution changes as we add excess of acid to an alkali.
Which letter denotes the area of the graph where both acid and salt are present?
When both acid and salt are present, the pH of the solution becomes less than 7 .
From the graph, the pH is less than 7 at only part D
So, the correct answer is (D)