Q.

In silicon dioxide :

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a

Silicon atom is bonded to two oxygen atoms

b

there are double bonds between silicon and oxygen atoms

c

Each silicon atom is bonded to four oxygen atoms and each oxygen atom is bonded to two silicon atoms

d

each silicon atom is bonded to two oxygen atoms and each oxygen atom is bonded to two silicon atoms

answer is D.

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Detailed Solution

Silicon dioxide exhibits polymorphism. It is a network solid in which each Si atom is surrounded tetrahedrally by four oxygen atoms. 
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In silicon dioxide :