Which one of the following will not give a flame test?

As the alkaline earth metals (except $Be$) tend to lose their valence electrons readily,they act as:

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:

Which of the following gives a green color in the flame test?

Plaster of Paris is used:

The thermal stability of $MCO_3$ (where $M$ is an alkaline earth metal) follows the order: