$Fe$ is made passive by

The minimum temperature required for a non-catalytic reaction between $N_2$ and $O_2$ is (in $K$)

Calcium phosphide reacts with water to form $Ca(OH)_2$ and $X$. When $X$ is passed into $CuSO_4$ solution,$Y$ and $H_2SO_4$ are formed. What is $Y$?

Identify the correct set of $13^{th}$ group elements which do not form amphoteric oxides?

Nitrogen exists as $N_2$,whereas phosphorus exists as $P_4$. This is because ..........

With which of the following does $FeSO_4$ form a brown ring?