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Which of the following is an amorphous solid?

(i) Graphite (C)

(ii) Quartz glass (SiO_2)

(iii) Chrome alum

(iv) Silicon carbide (SiC)

Answers (1)

The answer is the option (ii)

 

Crystalline Silica (Quartz)

Amorphous silica (Glass)

1.

They are crystalline in nature.

Light white powder appearance

2.

All the 4 corners of silica tetrahedron are shared by others to give a solid network.

The silica tetrahedron are randomly joined giving rise to polymeric chains, sheets or 3-Dimensional units.

3.

It has high melting point (1710^{\circ} C)

It does not have any sharp melting point and softens gradually to liquid on heating.

 

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