The basic structural unit of feldspar, zeolites, mica, and asbestos is :
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- \(\mathrm{(SiO_4)^{4-}}\)
- \(\mathrm{(SiO_3)^{2-}}\)
- \(\mathrm{SiO_2}\)
The Correct Option is B
Solution and Explanation
Each Si is bonded to four O atoms, giving the orthosilicate unit \(\mathrm{(SiO_4)^{4-}}\); different silicate types arise from sharing 0, 1, 2, 3 or 4 oxygen atoms between tetrahedra.
Option (1) is the silicone polymer \(\mathrm{[-R_2Si-O-]_n}\) (R = Me), not a silicate unit; \(\mathrm{(SiO_3)^{2-}}\) is the repeating unit of single-chain silicates only, and \(\mathrm{SiO_2}\) is silica.
Answer: (2) \(\mathrm{(SiO_4)^{4-}}\)
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