Which of the following statement is/are correct for double chain silicates?
A
There are two types of tetrahedra: those sharing 2 vertices and those sharing only 1 vertices.
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B
There are two types of tetrahedra: those sharing 3 vertices and those sharing only 2 vertices.
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C
There are only one type of tetrahedra.
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D
None of the above
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Solution
The correct option is B There are two types of tetrahedra: those sharing 3 vertices and those sharing only 2 vertices. The general formula of double chain silicates is [(Si4O11)6n−n]. Two simple chains are joined together by shared oxygen. There are two types of tetrahedra: those sharing 3 vertices and those sharing only 2 vertices.