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 :

Options

A. `Mg(HCO_(3))_(2)` and `Mg(OH)_(2)`
B. `Ca(HCO_(3))_(2)` and `Ca(OH)_(2)`
C. `Ca(HCO_(3))_(2)` and `CaCO_(3)`
D. `Mg(HCO_(3))_(2)` and `MgCO_(3)`

Answer

A:C

Explanation

`Mg(CHO_(3))_(2) overset(Delta)(to)MgCO_(3aq)+CO_(2(g))+H_(2)O_((1))`
`MgCO_(3aq) underset("Hydrolysis")overset(Delta)(to)underset("ppt".)(Mg(OH)_(2))darr+CO_(2(g))+H_(2)O`
`(Mg(OH)_(2)` is less soluble than `MgCO_(3)` in aqueous medium)