When $Na$ is heated at $300\,^oC$,it forms $X$. It absorbs $CO_2$ to form $Na_2CO_3$ and $Y$. What is $Y$?

On dissolving a moderate amount of sodium metal in liquid $NH_3$ at low temperature,which one of the following does not occur?

Both lithium and magnesium display several similar properties due to the diagonal relationship; however,the one which is incorrect is:

Which of the following statements is false?

$KO_2 + CO_2 + H_2O \xrightarrow{\text{more } CO_2} [X] + [Y]$
Products $[X]$ and $[Y]$ are respectively

Which elements of group $1$ and $2$ differ from the other elements of the same group? Give a brief explanation of the diagonal relationship.