Which of the following statements is false? A. Temporary hardness is the hardness caused by calcium and magnesium carbonate and bicarbonates. B. Temporary hardness can be removed by boiling water. C. Permanent hardness is the hardness due to chloride, nitrate, sulphate, silicate and phosphates of calcium and magnesium. D. Among the hardness units, there is equation 1.25 AS = 1 IS = 1.79 FS.

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