Formulae of various silicates are given in left column. Match them with their type.
A
Ortho silicates
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B
Pyro silicates
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C
Cyclic silicates
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D
2D-sheet silicates
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Solution
Ortho silicates are discrete units of silicates. They have a formula of SiO4−4.
Pyro silicates are formed when two silicate units share one oxygen atom. Their formula is Si2O6−7 .
Cyclic silicates are formed when each silicate unit shares two of its oxygen atoms with two adjacent silicon units respectively. Their formula is (Si2O3)2n−n.
When three of oxgen atoms present in a silicate unit are shared with other silicate units, 2D-sheet silicates are formed. They have the formula (Si2O5)2n−n .