Question

Which one of the following is a covalent crystal?

(A) Ice
(B) Rock salt
(C) Dry ice
(D) Quartz

Answer 1

Quartz is a covalent crystal.

Option: D

Explanation:  

• Quartz is a chemical crystal which is related to the quaternary structure of Silicone oxide.  

• Silicon oxide is a pure hard crystal that's is formed due to chemical bonds between the different molecules of the oxide. It has uniaxial optic property.  

• The beta structure of quartz has an angle of 56 degrees at its edges. On the other hand dry ice is the solid form of carbon dioxide, Rock salt is sodium chloride.  

• They all are either ionic crystal or through hydrogen bond.

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Answer 2

Quartz is a covalent crystal.  

Option (D)

Explanation:

• Quartz is the type of chemical crystal which is related with the silicon oxide. Silicon oxide is the purely hard crystal which forms by the chemical bonds between the molecules of the oxide.
• It has the uniaxial optic property. The quartz is formed by the tightly packed atoms which are unable to separate.
• The structure is depending on the atoms bonding of the molecular crystals as the water and carbon-di-oxide has the loose bonding.

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