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The basic structural unit of feldspar, zeolites, mica and asbestos is:
1. (SiO3)2-
2. SiO2
3. (SiO4)4-
4. \({\left( { - \begin{array}{*{20}{c}} {\begin{array}{*{20}{c}} {\rm{R}}\\ | \end{array}}\\ {{\rm{Si}}}\\ {\begin{array}{*{20}{c}} |\\ {\rm{R}} \end{array}} \end{array} - {\rm{O}} - } \right)_{\rm{n}}}\left( {{\rm{R}} = {\rm{Me}}} \right){\rm{\;}}\)

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Correct Answer - Option 3 : (SiO4)4-

Concept:

The basic structural unit of feldspar, zeolites, mica and asbestos is SiO44-.

These are the examples of silicates, the basic unit of each of them is SiO.

Zeolites: Hydrated alumino silicates having negative charge which is balanced by cations such as Na+, K+ or Ca2+

Silicates Compounds with basic unit SiO44-, each Si atom is linked to four oxygen atom tetrahedrally, joined by corners. It is also known as hydrated aluminium silicate.

Mica: It is a potassium aluminium silicate KAl3Si3O10(OH2). The mica group of sheet silicate (phyllosilicate) minerals includes several closely related materials having nearly perfect basal cleavage. All are monoclinic, with a tendency towards pseudohexagonal crystals, and are similar in chemical composition. The nearly perfect cleavage, which is the most prominent characteristic of mica, is explained by the hexagonal sheet-like arrangement of its atoms.

Asbestos is a hydrous magnesium silicate with the chemical composition: Mg3 Si2 O5 (OH2).

Asbestos is a term used to refer to six naturally occurring silicate minerals. All are composed of long and thin fibrous crystals; each fiber being composed of many microscopic 'fibrils' that can be released into the atmosphere by abrasion and other processes.

Asbestos is a well-known health hazard, and also used as a building material is now banned in many countries. Inhalation of the fibres can lead to various lung conditions, including asbestosis and cancer.

Feldspar is a potassium silicate KAlSi3 O8 and various sub-types of feldspar are available in earth crust. Silicate is a general name given to a group of minerals which have silicon-oxygen bonds with general formula \({({S_ + }{O_4}^{x - })_n}\). Therefore, option (c) is correct. 

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