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Question: When \[\alpha - \] quartz is heated to \[575^{\circ}C\]it changes to: A) onyx B) \[\beta - \]qua...

When α−\alpha - quartz is heated to 575∘C575^{\circ}Cit changes to:
A) onyx
B) β−\beta - quartz
C) tridymite
D) Crystoblite

Explanation

Solution

We need to know that the general formula of quartz is (SiO2)n{{\text{(Si}}{{\text{O}}_{\text{2}}}{\text{)}}_{\text{n}}} . One of the silicates is commercially called quartz. Quartz is also used for making glass. In this quartz silicon and oxygen are arranged in tetrahedral nature. In quartz, each silicon atom is surrounded by four oxygen atoms. Silicates are almost present in most of the earth crust. There are six types of silicates that are majorly classified. This classification is based on dimension. There are ten types of silicates that are majorly classified. This classification is based on the structure, number of silicon atoms and oxygen atom in the structure.

Complete step by step answer:
When α−\alpha - quartz is heated to 575∘C575^{\circ}C it changes to β−\beta - quartz.
This kind of conversion of α−\alpha - quartz is heated to 575∘C575^\circ C it changes to β−\beta - quartz. This phenomenon is called inversion.

Note:
We have to know that the orthosilicates, tectosilicates, Nesosilicates, pyro silicates, cyclic silicates, inosilicates, phyllosilicates, ring silicates, sorosilicates and sheet silicates are classification of silicates is based on the structure, number of silicon atom and oxygen atom in the structure. Orthosilicates, tectosilicates, pyro silicates, cyclic silicates, inosilicates and phyllo silicates are classified based on the dimension. Quartz is also one of the silicates. Quartz comes in tectosilicates. Quartz is one of the three dimensional silicates. Phyllosilicates and sheet silicates are similar kinds of silicates based on the dimension of the structure. These are two dimensional silicates. Tectosilicates are three dimensional silicates. Cyclic silicates and ring silicates are similar of silicates is based on the closed structure. Ortho silicates and Neso silicates are similar of silicates is based on the number of silicon atom and oxygen atom in the structure. Pyro silicates and soro silicates are similar of silicates is based on the number of silicon atom and oxygen atom in the structure. Inosilicates is further classification of silicates based on the structure as chain silicates and double silicates.