Which of the following reactions can generate ‘ NO ’ gas

Decomposition of $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2$

Cu with very dil. ${\mathrm{HNO}}_3(<50\mathrm{\%})$

catalytic oxidation of ${\mathrm{NH}}_3$ by Pt -Gauze at very high temperature

${\mathrm{N}}_2+{\mathrm{O}}_2\stackrel{ }{\underset{\text{in the sky }}{\overset{\text{ lightening }}{\to }}}$