Question

The pH of an aqueous solution of $H_2{O}_2$ is 6.0. Some chlorine is bubbled through this solution. The pH of the resulting solution will be ____.

• A. 6
• B. 7
• C. Less than 6
• D. More than 7

Answer 1

Answer: (C)

Less than 6

Chlorine reacts with hydrogen peroxide to form hydrochloric acid.

$H_2{O}_2+C{l}_2\to 2HCl+O_2$

This increases the hydrogen ion concentration.

Hence, pH will be less than 6.

Option C is correct.