Permanent hardness of water is due to presence of

NDA NA Exam I 2015 Questions

Question 95 Permanent hardness of water is due to presence of

A) sulphates of sodium and potassium
B) sulphates of magnesium and calcium
C) carbonates of sodium and magnesium
D) bicarbonates of magnesium and calcium

Answer: sulphates of magnesium and calcium

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