Natural silica___________________?
Correct answer: E. All A., B. and C.
- A. Mainly contains quartz
- B. Is not stable at high temperature
- C. Transforms to other allotropic forms i.e. Tridymite and Cristobalite involving very high
- D. volume changes
- E. All A., B. and C.
Explanation
Natural silica is chiefly quartz, but quartz is not the stable high-temperature form. It changes through tridymite and cristobalite, with associated volume changes, so all three statements are included.
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