Silica `(SiO_(2))` can be crystalline as well as amorphes with following properties
(I) it has hight and sharp melting point
(II) Crystalline
(III) The `SiO_(4)^(2)` letrahedral are randomly joined to give polymeric chains or three - demensional sheets
Which of the properties is/are matced with amophous solids?

Silica (SiO_(2)) can be crystalline as well as amorphous, with following properties I: crystalline II: the SiO_(4)^(4-) tetrahedra are randomly joined giving rise to polymeric chains of three-dimensional sheets III : have high and sharp m.p Which of I, II and III are not matched with amorphous solids

Compare the following properties of crystalline and amorphous solids. (i) Orderly arrangement (ii) Melting points

Describe giving reason which one of the following pairs has the property indicated? (a). Fe or Cu has higher melting point. (b). Co^(2+) or Ni^(2+) has lower magnetic moment.

Describe giving reason which one of the following pairs has the property indicated? (a). Fe or Cu has higher melting point. (b). Co^(2+) or Ni^(2+) has lower magnetic moment.

Describe giving reason which one.of the following pairs has the property indicated i. Fe or Cu has higher melting point ii. '(Co)^2+or '(Ni)^2+ has lower magnetic moment.

Which of the following statements are true about quartz, A) it is pure crystalline form of silica B) it is a tetrahedral polymer of SiO_(2) C) UV light can pass through quartz

Solids have properties like rigidity a definite shape and a define volume. If intermolecular forces are greater than thermal energy, substances exist as solid. Solids can be classified into two types. Crystalline solids and amorphous solids, Crystalline solids have regular arrangement of particles, definite geometric shapes, sharp melting points and definite heat of fusion. They are anisotropic and undergo clean cleavage. On the other hand, amorphous solid have no regular arrangement of particles, irregular shapes, melt over a range of temperature, no definite heat of fusion. They are isotropic and undergo irregular cleavage. The melting point of crystalline solids is sharp due to: