Which of the following is NOT a common use of sulfuric acid (H2SO4)?

The correct answer identifies "removing chlorine" as not a common use of sulfuric acid (H2SO4). While sulfuric acid has numerous applications in wastewater treatment and various industrial processes, the removal of chlorine is typically not one of them. Sulfuric acid is commonly used for neutralization of waste and pH adjustment, as it can effectively lower the pH of wastewater, thus facilitating compliance with environmental regulations. Additionally, it acts as a dehydrating agent in many chemical reactions by absorbing water and promoting reactions that lead to the formation of anhydrous compounds.

In contrast, the removal of chlorine from water is more often accomplished using agents such as sodium thiosulfate, activated carbon, or chemical reduction methods, rather than sulfuric acid. This makes the answer clear, as while sulfuric acid plays significant roles in other processes, it does not serve as a primary agent for chlorine removal.