Q. The role of alum in water purification is

  • (A) to kill bacteria
  • (B) to coagulate mud particles
  • (C) to remove salt
  • (D) to remove gases
✅ Correct Answer: (B) to coagulate mud particles

Published by Physics Walla ⭐ 649 Points at 13-Oct-2022 03:22 pm in Physics

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