A) sodium silicate
B) silicon carbide
C) silicon
D) silica
Correct Answer: D
Solution :
Silica \[(Si{{O}_{2}}):\] It is widely distributed in nature as sand which is the commonest constituent of the earths crust. It exists in three crystalline forms: Quartz, Tridymite and Cristobalite. The purest form of silica is quartz or rock crystal which forms hexagonal prisms terminating in hexagonal pyramids. So, quartz is crystalline variety of silica.
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