The temporary hardness of a water sample is due to compound $X$. Boiling this sample converts $X$ to compound $Y$. $X$ and $Y$,respectively,are
- A$Mg(HCO_3)_2$ and $MgCO_3$
- B$Ca(HCO_3)_2$ and $CaO$
- C$Mg(HCO_3)_2$ and $Mg(OH)_2$
- D$Ca(HCO_3)_2$ and $Ca(OH)_2$
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