Permanent hardness of water can be removed by?
A
filtration
B
adding slaked lime
C
adding caustic soda
D
boiling
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
- this hardness cannot be removed by boiling. We can remove this hardness by treating the water with washing soda, caustic soda and permutit
Source: WAEC / JAMB / NECO Classroom Archive (Record #4474)