Discussion
Temporary hardness is due to the
Answer: B
Correct answer: bicarbonates of calcium and magnesium
Temporary hardness is the part removed by boiling, and it is due to the bicarbonates, which decompose on heating to give the insoluble carbonate, carbon dioxide and water. The sulphates and chlorides are unaffected by boiling and constitute the permanent hardness - which is why the two are treated by different chemicals in the lime-soda process.
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