Match the materials listed in the column`-I` with type of silicates listed in column `-II` , and select the correct answer using the code given below the list `:`
`{:("Column"-I,,"Column"-II),((a)"Spondumene",,(p)"Two dimensional sheet silicates"),((b)"Throteveitite",,(q)"Pyrosilicates"),((c )"Kaolin",,(r)"Chain silicates"),((d)"Quartz",,(e)"Three dimensional sheet silicates."):}`

Options

A. `{:(,"(a)","(b)","(c)","(d)"),(,r,q,p,s):}`
B. `{:(,"(a)","(b)","(c)","(d)"),(,q,r,s,p):}`
C. `{:(,"(a)","(b)","(c)","(d)"),(,r,p,q,s):}`
D. `{:(,"(a)","(b)","(c)","(d)"),(,s,q,p,r):}`

Answer

1

Explanation

`(a)` In case of simple chains two corners of each tetrahedron are shared `&` they form a long chain of tetrahedron. Their general formula is also same as the cyclic silicates `i.e. (SiO_(3))_(n)^(2n-)`
Similarly, double chain silicates can be drawn in which two simple chains are joined together by shared oxygen. Such compounds are also known as amphiboles. The amphiboles. The asbestos mierals is a well known example of double chain silicates. The anions of double chain silicates have general formula `(Si_(4)O_(11))_(n)^(6-)`
`e.g.,` Synthetic silicates `(Li_(2)SiO_(3),Na_(2)SiO_(3))`, Spondumene `(LiAl(SiO_(3))_(2))`,
`(b)` In pyrosilicates two tetrahedral units are joined by sharing by sharing oxygent at one corner thereby giving `[Si_(2)O_(7)]^(6-)` units `e.g.` Theorteveitite `(Sc_(2)Si_(2)O_(7))`, Hemimorphite `(Zn_(3)(Si_(2)O_(7))Zn(OH)_(2)H_(2)O)`.
`( c )`In two dimensional sheet silicates, three oxygen atoms of each tetrahedral are shared with adjacent `SiO_(4)^(4-)` tetrahedrals. Such sharing forms two dimension sheet structure with general formula `(Si_(2)O_(5))_(n)^(2n-)` `e.g.` Talc `(Mg(Si_(2)O_(5))_(2)Mg(OH)_(2),"Kaolin"Al_(2)(OH)_(4)(Si_(2)O_(5))`.
`(d)` Three dimensional silicates involve all four oxygen atom in sharing with adjacent `SiO_(4)^(4-)` tetrahedral units. e.q. Quartz, Tridymite, Crystobalite, Feldspar, Zeolite and Ultramarines.