Pyrosilicates are the silicates in which two tetrahedral units are linked at:

one point

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two points

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three points

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none of the above

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Solution

The correct option is A one point
Pyrosilicates contain ${S i}_{2} O_{7}^{6 -}$ ions which are formed by joining two tetrahedral $S i O_{4}^{4 -}$ which share one oxygen atom at one corner e.g. thortveitite.

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(H_{3} B O_{3})

[S i O_{4}]^{-}

[S i O_{4}]^{-}

Name the structure of silicates in which three oxygen atoms of $[S i O_{4}]^{-}$ are shared:

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