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11/09/2020 7:21 pm
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Which of the following is an amorphous solid?
(a) Graphite (C)
(b) Quartz glass (SiO2)
(c) Chrome alum
(d) Silicon carbide (SiC)
1 Answer
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11/09/2020 7:30 pm
(b) Quartz glass (SiO2)
Explanation:
Crystalline Silica (Quartz)
1. Crystalline in nature. Also called quartz.
2. All four corners of SiO44- tetrahedron are shared by others to give a network solid.
3. High and sharp melting point (1710 °C).
Amorphous Silica (Glass)
1. Light white powder.
2. The SiO44- tetrahedron are randomly joined giving rise to polymeric chains, sheets or three dimensional units.
3. Does not have sharp melting point. On heating softens gradually to liquid.