Given below are two statements : Statement I : The number of pairs...

Statement I: Checking amphoteric nature of oxide pairs:
$[SiO_2, CO_2]$: Both acidic (non-metal oxides)
$[SnO, SnO_2]$: Both amphoteric
$[PbO, PbO_2]$: $PbO$ is amphoteric but $PbO_2$ is predominantly acidic/oxidizing
$[GeO, GeO_2]$: Both amphoteric (Ge is metalloid)
2 pairs have both oxides amphoteric. Statement I is true.
Statement II: $BF_3$ has B with 6 valence electrons (electron deficient), acts as Lewis acid, forms $BF_3 \cdot NH_3$ adduct, has $sp^2$ hybridization giving trigonal planar geometry. Statement II is true.