$(a)$ Classify the following oxides as neutral,acidic,basic,or amphoteric:
$CO, B_2O_3, SiO_2, CO_2, Al_2O_3, PbO_2, Tl_2O_3$
$(b)$ Write suitable chemical equations to show their nature.

(N/A) Neutral oxide: $CO$
Acidic oxides: $B_2O_3, SiO_2, CO_2$
Amphoteric oxides: $Al_2O_3, PbO_2$
Basic oxide: $Tl_2O_3$
$(b)$ $(i)$ Acidic oxides $(B_2O_3, SiO_2, CO_2)$ react with bases:
$B_2O_3 + 2 NaOH \rightarrow 2 NaBO_2 + H_2O$
$SiO_2 + 2 NaOH \rightarrow Na_2SiO_3 + H_2O$
$CO_2 + 2 NaOH \rightarrow Na_2CO_3 + H_2O$
$(ii)$ Amphoteric oxides $(Al_2O_3, PbO_2)$ react with both acids and bases:
$Al_2O_3 + 2 NaOH \rightarrow 2 NaAlO_2 + H_2O$
$Al_2O_3 + 3 H_2SO_4 \rightarrow Al_2(SO_4)_3 + 3 H_2O$
$PbO_2 + 2 NaOH \rightarrow Na_2PbO_3 + H_2O$
$(iii)$ Basic oxide $(Tl_2O_3)$ reacts with acids:
$Tl_2O_3 + 6 HCl \rightarrow 2 TlCl_3 + 3 H_2O$