In which of the following form does sili...

In which of the following form does silicon exist as silica, `SiO_(2)` ?

Cristobalite

Tridymite

Quartz

All of these

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Silicon dioxide occurs in a number of different crystalline forms: quartz, tridymite, and cristobalite, each of which has a high and a low temperature modification.

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In which of the following form does silicon exist as silica, `SiO_(2)` ?

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