Question
Question: Water is said to be permanently hard when it contains:...
Water is said to be permanently hard when it contains:
A
Chloride and sulphates of Mg and Ca.
B
Bicarbonates of Na and K.
C
Carbonates of Na and K.
D
Phosphate of Na and K.
Answer
Chloride and sulphates of Mg and Ca.
Explanation
Solution
CaCl2, CaSO4, MgCl2, MgSO4, When dissolve in water it becomes permanently hard.