Q. Which of these chemicals is used as a water softening agent?
Answer: Washing soda
Notes: Washing soda's chemical formula is Na₂CO₃. It binds calcium and magnesium present in the water and creates an insoluble substance.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 9 in Chemistry-19-Soaps & Detergents in above course in App.