1.

Out of CO_2, SiO_2, GeO_2, SnO_2 and PbO_2

Answer»

solid CARBON dioxide and silicon dioxide are hard solid
`CO_2` and `SiO_2` are acidic and `SnO_2` is AMPHOTERIC
`PbO_2` REACTS with `H_2SO_4` to give `PbSO_4`
`CO_2` does not contain `p pi - p pi` bonding.

Solution :Only `SiO_2` is a solid network of `SiO_2` molecules.
`CO_2 + H_2O rarr H_2CO_3`
`SnO_2 + H^(+) rarr Sn^(2+) + H_2O`
`SnO_2 + OH^(-) rarr Sn(OH)_(6)^(4-)`
`2PbO_2 + 2H_2SO_4 rarr 2PbSO_4 + 2H_2O + O_2`.


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