The salt that causes hardness in water and also liberates carbon dioxide on heating is,
a. magnesium bicarbonate
b. calcium chloride
c. magnesium sulphate
d. calcium sulphate.
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magnesium bicarbonate is your answer
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The salt that causes hardness in water and also liberate carbon dioxide on heating among magnesium bicarbonate, calcium chloride, magnesium sulphate and calcium sulphate is magnesium bicarbonate.
Hardness in water occurs because of the existence of bicarbonate in the compound.
When it is heated, it decomposes and breaks into water vapour, carbon dioxide and magnesium carbonate, which tends to make water hard again.
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