MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistrySolid statePrevious Year Questions
Which one of the following is a covalent crystal? [KCET 2011]
A.Rock salt (b) Ice
C.Quartz (d) Dry ice✓ Correct
Explanation
Quartz or silicon dioxide also known as silica has a giant covalent structure. In quartz each silicon atom is covalently bonded to four oxygen atoms. Each oxygen atom is covalently bond with two silicon atoms and has an extended covalent structure similar to diamond. Hence the correct answer is option (c)
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