Silica (SiO2) can be crystalline as well as amorphous with following properties: I. It has high and sharp melting point. II. Crystalline III. The SiO22- tetrahedral are randomly joined to give polymeric chains or three-dimensional sheets. Which of the properties is/are matched with amorphous solids?

Question

Silica (SiO2) can be crystalline as well as amorphous with following properties: I. It has high and sharp melting point. II. Crystalline III. The SiO22- tetrahedral are randomly joined to give polymeric chains or three-dimensional sheets. Which of the properties is/are matched with amorphous solids? (A) II and III (B) Only III (C) I and III (D) I and II

Tardigrade Admin · Accepted Answer

Amorphous solids are not crystalline and do not have definite melting points. SiO42- tetrahedral are randomly joined in the form of polymeric chain or three-dimensional sheets. <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/0ee91bae7989ccead29bf1495e8745a2-.png" />

$II$ and $III$

Only $III$

$I$ and $III$

$I$ and $II$

Amorphous solids are not crystalline and do not have\ definite melting points. $S i O_{4}^{2 -}$ tetrahedral are randomly joined in the form of polymeric chain or three-dimensional sheets.

II and III

Only III

I and III

I and II

Amorphous solids are not crystalline and do not have\ definite melting points. SiO42−​ tetrahedral are randomly joined in the form of polymeric chain or three-dimensional sheets.

$II$ and $III$

Only $III$

$I$ and $III$

$I$ and $II$

Amorphous solids are not crystalline and do not have\ definite melting points. $S i O_{4}^{2 -}$ tetrahedral are randomly joined in the form of polymeric chain or three-dimensional sheets.