1.

Which among the following is a false statement ?

Answer»

`SiO_(2)`has a structure similar to that of`CO_(2)`
Natural Si exists only in the combined state
Si can be prepared by reducing`SiO_(2)`with Mg
Si does not exist in graphite-like structure, but exists only in diamond like structure

Solution :(A)`SiO_(2)` has three-dimensional network structure of `Si-O`bonds, while carbon dioxide consists of discrete `CO_(2)`molecules. `SiO_(2)`is solid, WHEREAS `CO_(2)`is a gas
(B) Because of its great AFFINITY for oxygen, Si always OCCURS as the oxide, silica`(SiO_(2))`or in the form of silicates, which are the compounds of `SiO_(2)`with other metal oxides.
(C) `SiO_(2)+2Mg to Si+2MgO`
(D) The reluctance of silicon to form `p pi-p pi`bonds to itself is clearly shown by the fact that silicon does not exist in graphite-like structure, but only in diamond like structure.


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