The correct order of density for the alkaline earth metals is:

When $MgCl_2 \cdot 6H_2O$ is strongly heated,then it forms

Which of the following is least thermally stable?

Assertion $(A)$: $Be$ and $Mg$ do not impart any colour to the flame.
Reason $(R)$: The electrons in them are too strongly bound to get excited by the energy of the flame.
The correct option among the following is:

$BaSO_4$ and carbon on heating react to produce:

Which of the following statements is false?