Permanent hardness of water is due to the presence of:

Question: Permanent hardness of water is due to the presence of:

(a) Sulphate of sodium and potassium

(b) Sulphates of magnesium and calcium

(c) Carbonate of sodium and magnesium

(d) Bicarbonate of magnesium and calcium

Answer: (b) Sulphates of magnesium and calcium

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