The correct order of density of $Be, Mg, Ca, Sr$ is

In which of the following is the hydration energy higher than the lattice energy?

Choose the correct statement$(s)$:
$A.$ Beryllium oxide is purely acidic in nature.
$B.$ Beryllium carbonate is kept in the atmosphere of $CO_2$.
$C.$ Beryllium sulphate is readily soluble in water.
$D.$ Beryllium shows anomalous behavior.
Choose the correct answer from the options given below:

How is beryllium anomalous from other alkaline earth metal elements?

The correct order of decomposition temperature of $MgCO_3$ $(X)$,$BaCO_3$ $(Y)$,$CaCO_3$ $(Z)$ is

Which compound is used in medicine as a barium meal for intestinal $X$-ray?