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Q. |
Quartz is a crystalline form of - |
A. | Alumina |
B. | Glass |
C. | Silica |
D. | Limestone |
Answer» C. Silica | |
Explanation: Quartz is made up of a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2. Tridymite and cristobalite are hightemperature polymorphs of SiO2 that occur in high-silica volcanic rocks. Coesite is a denser polymorph of quartz found in some meteorite impact sites and in metamorphic rocks. |
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