The temporary hardness of a water sample...

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 `Mg(OH)_(2)`

B

`Ca(HCO_(3))_(2)` and `CA(OH)_(2)`

C

`Ca(HCO_(3))_(2)` and `Ca(OH)_(2)`

D

`Mg(HCO_(3))_(2)` and `MgCO_(3)`

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