1.

Write suitable chemical equations to show their natural.

Answer»

SOLUTION :(i) As `B_2O_3, SiO_2 and CO_2` are acidic in nature, they react with alkalis to form salts.
`B_2O_3 + 2NaOH underset("Sodium METABORATE")(to 2NaBO_2) + H_2O`
`SiO_2 + 2NaOH underset("Sodium silicate")(to Na_2SiO_3) + H_2O`
`CO_2 + 2NaOH underset("Sodium carbonate")(to Na_2CO_3) + H_2O`
(ii) `Al_2O_3 and PbO_2` reacts with both ACIDS and alklis as they are amphoteric in nature.
`Al_2O_3 and PbO_2` reacts with both acids and alkalis as they are amphoteric in nature.
`Al_2O_3+ 3H_2SO_4 to Al_2(SO_4)_3 + H_2O`
`underset("Alumina")(Al_2O_3) + 2NaoH underset("Sodium aluminate")(overset(Delta)to 2NaAlO_2) + H_2O`
`2PbO_2 + 2H_2SO_4 to 2PbSO_4 + 2H_2O + O_2`
`underset("Lead dioxide")(PbO_2) + 2NaOH underset("Sodium plumbate")(to Na_2PbO_3)to + H_2O`
(iii) `Tl_2O_3` reacts with acids as it is a BASIC oxide.
`Tl_2 O_3 + 6HCl to 2TlCl_3 + 3H_2O`


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