Consider the oxides of group 14 elements $SiO _2, GeO _2, SnO _2, PbO _2, CO$ and $GeO$. The amphoteric oxides are
(1) $GeO, GeO _2$
(2) $SiO _2, GeO _2$
(3) $SnO _2, PbO _2$
(4) $SnO _2, CO$
$SnO _2$ and $PbO _2$ are amphoteric
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