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 :

  1. $\mathrm{Mg}\left(\mathrm{HCO}_{3}\right)_{2}$ and $\mathrm{Mg}(\mathrm{OH})_{2}$

  2. $\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}$ and $\mathrm{Ca}(\mathrm{OH})_{2}$

  3. $\mathrm{Mg}\left(\mathrm{HCO}_{3}\right)_{2}$ and $\mathrm{MgCO}_{3}$

  4. $\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}$ and $\mathrm{CaO}$

Correct Option: 1


Temporary hardness is caused by bicarbonates of calcium and magnesium. On boiling following changes occurs,

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