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

Which among the following oxides is acidic in nature?

The statement that is $NOT$ correct is:

In which oxidation state,group $15$ elements act as Lewis base?

Assertion $:$ Reducing nature of pnicogen hydrides increases on moving down the group.
Reason $:$ Thermal stability of pnicogen hydrides decreases on moving down the group.

Which of the following compounds has a $P-P$ bond?