2043Every Day ScienceMedium
Permanent hardness of water can be removed by adding __________?
ABleaching powder
BNone of these
CWashing soda
DChlorine
Correct answer
C. Washing soda
Explanation
Sodium carbonate, Na2CO3, is also known as washing soda. It can remove temporary and permanent hardness from water. Sodium carbonate is soluble but calcium carbonate and magnesium carbonate are insoluble.