# 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:Option 1) $Mg(HCO_{3})_{2}$ and $Mg(HO)_{2}$      Option 2)$Ca(HCO_{3})_{2}$ and $Ca(HO)_{2}$Option 3)$Mg(HCO_{3})_{2}$ and $MgCO_{3}$Option 4)$Ca(HCO_{3})_{2}$ and CaO

According to NCERT answer would be option (1)  $Mg(HCO_{3})_{2}$ and $Mg(HO)_{2}$

but According to general Chemistry answer would be (3) $Mg(HCO_{3})_{2}$ and $MgCO_{3}$

Option 1)

$Mg(HCO_{3})_{2}$ and $Mg(HO)_{2}$

Option 2)

$Ca(HCO_{3})_{2}$ and $Ca(HO)_{2}$

Option 3)

$Mg(HCO_{3})_{2}$ and $MgCO_{3}$

Option 4)

$Ca(HCO_{3})_{2}$ and CaO

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