Permanent hardness of water is due to the presence of chlorides and salts of calcium and magnesium. It can be removed by using .
A
caustic soda
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
washing soda
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
sulphates
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
bicarbonates
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct options are B washing soda C sulphates The permanent hardness of water is due to the dissolved chlorides and sulphates of magnesium and calcium. One of the method to remove it is by treating the hard water with washing soda, i.e., Na2CO3. This forms their respective insoluble carbonates which are removed by filtration. The reactions involved are: