Correct Answer: Option B

Explanation

When temporary hard water is boiled for some time in a kettle, the inner surface of the kettle becomes coated with a deposit of Calcium trioxocarbonate(IV), CaCO\(_3\), which originated from Calcium hydrogen trioxocarbonate(IV), Ca(HCO\(_3\))\(_2\).

              Ca(HCO\(_3\))\(_2\) → CaCO\(_3\)  + H\(_2\)O + CO\(_2\)

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