In the given reaction,the oxide of sodium is .... $4Na + O_2 \to 2Na_2O$ and $Na_2O + H_2O \to 2NaOH$

Which of the following is most basic in character?

The electronic configuration of $Cs$ is

Which of the following elements forms a superoxide when it reacts with oxygen?

$A$ metal $M$ reacts with nitrogen gas to afford $M_3N$. $M_3N$ on heating at high temperature gives back $M$ and on reaction with water produces a gas $B$. Gas $B$ reacts with aqueous solution of $CuSO_4$ to form a deep blue compound. $M$ and $B$ respectively are

Identify the incorrect statement from the following.