engineering recuitment FCI JE 2022 Mock Test for CE/ME/EE (Phase I & II) General Science Chemistry Basic Concepts of Chemistry
Permanent hardness of water is due to the presence of
1
sulphates of sodium and potassium
2
sulphates of magnesium and calcium
3
carbonates of sodium and magnesium
4
bicarbonates of magnesium and calcium
5
None of the above