Basicity

Aluminium (III) oxide ( ${ Al }_{ 2 }{ O }_{ 3 }$ ) and zinc oxide ( $ZnO$ ) are amphoteric and will react with both acids and bases in neutralisation reaction. For example, Zinc oxide reacts with sulfuric acid (very acidic) to form Zinc sulfate and water

${ H }_{ 2 }S{ O }_{ 4 }$ + $ZnO$ $\rightarrow ZnS{ O }_{ 4 }+{ H }_{ 2 }O$

Zinc oxide can react with sodium hydroxide to form sodium zincate and water

$ZnO\quad +\quad 2NaOH\rightarrow { Na }_{ 2 }Zn{ O }_{ 2 }+{ H }_{ 2 }O$

Nitrogen is non-metal and will form acidic oxide with high oxide concentration. Thus nitrogen (V) oxide, ( ${ N }_{ 2 }{ O }_{ 5 }$ is acidic

Furthermore, magnesium is alkaline earth metal and MgO will be basic oxide. MgO only reacts with acids in neutralisation reaction.