Which of the following oxides of nitrogen is isoelectronic with $CO_2$?

The gases liberated when zinc reacts with dilute and conc. $HNO_3$ respectively are

$HNO_3 + P_4O_{10} \rightarrow HPO_3 + A$; the product $A$ is

Assertion : Molecular nitrogen is less reactive than molecular oxygen.
Reason : The bond length of $N_2$ is shorter than that of oxygen.

Determine whether the following statements are True $(T)$ or False $(F)$:
$1.$ Ammonia is produced from a mixture of $SO_2$ and $N_2$.
$2.$ $N_2H_2$ and $N_2H_4$ are formed from a mixture of $N_2/H_2$ in the Haber process.
$3.$ Compounds of $d$ or $f$ block elements are not used as catalysts in the Haber process.

Which of the following oxides is neutral?