In which of the following groups all the three members are of the alkaline earth metals family?

The halides of alkaline earth metals form hydrates such as $MgCl_2 \cdot 6H_2O$,$CaCl_2 \cdot 6H_2O$,$BaCl_2 \cdot 2H_2O$,and $SrCl_2 \cdot 2H_2O$. This indicates that the halides of group $2$ elements are:

Which of the following elements does not react with water to form metal hydroxide?

Chemical $A$ is used for softening temporary hard water. $A$ reacts with sodium carbonate to produce caustic soda. When $CO_2$ is passed through the solution of $A$,it turns milky. What is the chemical formula of $A$?

How is beryllium anomalous from other alkaline earth metal elements?

Bleaching powder is obtained by the reaction of chlorine gas with ........