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$2/$

\begin{array}{|c|c|c|}\hline \text{Basic oxide}&\text{Acidic oxide}&\text{Amphoteric oxide}&\text{Neutral oxide}\\\hline \text{CuO; BaO; ZnO;}{Al_2O_3; Ag_2O}&{CO_2; SO_3}&{Al_2O_3; ZnO}&{CO; NO}\\\hline \end{array}

$3/$

$a/$

$(1) CaO+CO_2 \to CaCO_3$
$(2) CaCO_3 \xrightarrow{t^{o}} CaO+CO_2$
$(3) CaO+H_2O \to Ca(OH)_2$

$(4) CaO+2HCl \to CaCl_2+H_2O$

$b/$

$(1) S+O_2 \xrightarrow{t^{o}} SO_2$

$(2) SO_2+2NaOH \to Na_2SO_3+H_2O$

$(3) Na_2SO_3+H_2SO_4 \to Na_2SO_4+SO_2+H_2O$

$(4) SO_2+H_2O ⇄ H_2SO_3$