Give an example of
a) acidic oxide of phosphorus
b) neutral oxide of nitrogen

${\mathrm{P}}_2{\mathrm{O}}_3,{\mathrm{P}}_2{\mathrm{O}}_5\text{ (or) }{\mathrm{P}}_4{\mathrm{O}}_6,{\mathrm{P}}_4{\mathrm{O}}_{10}$ are acidic oxides of phosphorus
$\because$ they form acids on hydrolysis.
Ex: ${\mathrm{P}}_4{\mathrm{O}}_{10}+6{\mathrm{H}}_2\mathrm{O}\to 4{\mathrm{H}}_3{\mathrm{PO}}_4$
N₂O, NO are neutral oxides of nitrogen.
They are neither acidic nor basic.