$Beryllium$ shows a diagonal relationship with:

Which one of the following alkaline earth metals does not form hydride when it is heated with hydrogen directly?

Assertion : Of the various chlorides of alkaline earth metals $BeCl_2$ is covalent in nature,whereas $MgCl_2$ and $CaCl_2$ are ionic compounds.
Reason : $Be$ is the first member of group $2$.

The order of thermal stability of carbonates of $IIA$ group is

The correct sequence of increasing melting points of $BeCl_2$,$MgCl_2$,$CaCl_2$,$SrCl_2$,and $BaCl_2$ is:

Which colour is developed in the solution when alkaline earth metals are dissolved in liquid ammonia?