Among the alkaline earth metals ($Be$,$Mg$,$Ca$,and $Sr$) of group $IIA$,which one forms an ionic chloride?

Which one of the following compounds is a peroxide?

Which of the following substances is unlikely to contain $CaCO_3$?

$CaCO_3$ $\xrightarrow[excess \ H_2O]{in \ CO_2} A$ $\xrightarrow{\Delta} B$
Identify $A$ and $B$.

$Ba$,$Ca$,and $Sr$ form halide hydrates. Their formulas are $BaCl_2 \cdot x H_2 O$,$CaCl_2 \cdot y H_2 O$,and $SrCl_2 \cdot z H_2 O$. The values of $x$,$y$,and $z$ respectively are:

Which of the following alkaline earth metals does not exhibit colour when heated in a flame?