Chemical $A$ is used for the removal of temporary hardness of water. Compound $A$ reacts with $Na_2CO_3$ to produce caustic soda. When $CO_2$ gas is passed through $A$,it turns milky. What is the chemical formula of $A$?
- A$CaCO_3$
- B$CaO$
- C$Ca(OH)_2$
- D$Ca(HCO_3)_2$
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