A. Free chlorine
B. Bromine
C. Iodine
D. Potassium permanganate
Correct Answer: Potassium permanganate ✔
Last Updated: February 08, 2019
A. Free chlorine
B. Bromine
C. Iodine
D. Potassium permanganate
Correct Answer: Potassium permanganate ✔
Last Updated: February 08, 2019