In the removal of temporary hardness of a sample containing $Ca^{2+}$,what is the number of moles of $Ca(OH)_2$ used per mole of $Ca(HCO_3)_2$ removed?

Which can be used to prepare pure and demineralised $H_2O$ ?

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

An inorganic salt $(A)$ is decomposed on heating to give two products $(B)$ and $(C)$. Compound $(C)$ is a liquid at room temperature and is neutral to litmus,while the compound $(B)$ is a colourless neutral gas. Compounds $(A)$,$(B)$ and $(C)$ are:

Which one of the following is not a method to remove permanent hardness of water?

Hardness of water is due to the presence of salts of