Question

# The basic structural unit of silicates is:

A
SiO
B
SiO44
C
SiO23
D
SiO24

Solution

## The correct option is A $$SiO_4^{4-}$$The basic unit of silicates is $$SiO_4^{4-}$$ as each silicon atom is bonded with 4 oxide ions tetrahedrally.The different types of silicates are:1) Orthosilicates- Contains one unit of $$SiO_4^{4-}$$ eg $$[Zn_2SiO_4]$$2) Pyrosilicates - Contains two unit of $$SiO_4^{4-}$$ along an oxygen atom eg-$$Si_2O_7^{6-}$$3) Cyclic or ring: The general formula is $$SiO_3^{2-}$$ eg-$$Si_3O_9^{6-}$$ Beryl -  $$Be_3Al_2Si_6O_{18}$$4) Chain silicates- These are formed by sharing 20 oxygen atoms by each tetrahedral. The general formula is :a)$$(SiO_3)_n^{2n-}$$b)$$(Si_4O_11)_n^{6n-}$$5) Two-dimensional sheet silicates: In this 3 oxygen atoms of each tetrahedral are shared with two adjacent $$SO_4^{4-}$$ tetrahedral. The general formula is $$(Si_2O_5)_n^{2n-}$$6) Three-dimensional sheet silicates: In these all four oxygen atoms are shared with adjacent $$SiO_4^{4-}$$ tetrahedral.Chemistry

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