Multiple choice business organisation and correspondence waste and its management sources of waste protecting our environment rules are for everyone Acidification of soil means Increase in H$^+$ ions Increase in pH Decrease in pH Both A and C Reveal answer Fill a bubble to check yourself D Correct answer Explanation Acidification is characterized by an increase in hydrogen ion concentration (H+), which mathematically corresponds to a decrease in the pH value (since pH is the negative log of H+ concentration).