1.

Name the elements of group `13` which form amphoteric hydroxides.

Answer» Alumiuium and gallium form amphoteric hydroxides.
`Al(OH)_(3)+3HCl toAlCl_(3)+3H_(2)O`
`Al(OH)_(3)+NaOH toNaAlO_(2)+2H_(2)O`
`Ga(OH)_(3)+3HCl toGaCl_(3)+3H_(2)O`
`Ga(OH)_(3)+NaOH toNaGaO_(2)+2H_(2)O`


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