Q1 of 18 Page 9

A sample of hard water is heated in a utensil. A white deposit of calcium carbonate is formed. This is due to the presence of

Hard water generally contains magnesium and calcium


bicarbonates. The other options given above are not present in hard water. When hard water is boiled, calcium bicarbonate decomposes into calcium carbonate and carbon dioxide.


Ca(HCO3)2 CaCO3 + H2O + CO2

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