a. Classify following oxides as neutral, acidic, basic or atphoteric: `CO,B_(2)O_(3),SiO_(2),CO_(2),Al_(2)O_(3),PbO_(2),Tl_(2)O_(3)`.
b. Write suitable chemical reaction to show their nature.

Explanation

a.Neutral oxides:`CO`
Acidic oxides:`B_(2)O_(3),SiO_(2),CO_(2)`
Basic oxide:`Tl_(2)O_(3)`
Amphoteric oxide:`Al_(2)O_(3),PbO_(2)`
b. Being acidic oxides:`B_(2)O_(3),SiO_(2),CO_(2)` react with bases to form salts.
`B_(2)O_(3)+2NaOHtounderset("Sodium metaborate")(2NaBO_(2)+H_(2)O)`
`SiO_(2)+2NaOHtounderset("Sodium silicate")(Na_(2)SiO_(3)+H_(2)O)`
`CO_(2)+2NaOHtounderset("Sodium carbonate")(Na_(2)CO_(3)+H_(2)O)`
Being basic oxide:`Tl_(2)O_(3)` reacts with acid to form salt.
`Tl_(2)O_(3)+6HCl to underset("(soluble)")(2TlCl_(3))+3H_(2)O`
Being amphoteric oxides,`Al_(2)O_(3),PbO_(2)` dissolve both in acids and bases.
`Al_(2)O_(3)+H_(2)SO_(4)toAl_(2)(SO_(4))_(3)+3H_(2)O`
`Al_(2)O_(3)+2NaOHtounderset("aluminate")underset("Sodium")(NaAlO_(2))+H_(2)O`
`2PbO_(2)+2H_(2)SO_(4)tounderset("Lead sulphate")(2PbSO_(4))+2H_(2)O+O_(2)`
`PbO_(2)+2NaOHtounderset("Sodium plumbate")(Na_(2)PbO_(3))+H_(2)O`