Q. 1 C4.6( 16 Votes )

A sample of hard

Class 8th Karnataka Board - Science Part II 13. Water

Answer :

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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