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Silicates - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main
Quick Facts
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Silicates - 1, Silicates - 2 are considered the most difficult concepts.
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35 Questions around this concept.
Solve by difficulty
The basic structural unit of feldspar, zeolites, mica, and asbestos is :
The structural unit of quartz is:
The empirical formula of a sheet silicate is :
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Which of the following compounds is not a silicate:
Identify the cyclic silicate ion given in the figure below
$\mathrm{Me}_3 \mathrm{SiCl} {\text { is used during polymerisation of organic silicones because }}$
(i) the chain length of organic silicone polymers can be controlled by adding $\mathrm{Me} _3 \mathrm{SiCl}$
(ii) $\mathrm{Me}_3 \mathrm{SiCl} {\text { blocks the end terminal of a silicone polymer }}$
(iii) $\mathrm{Me}_3 \mathrm{SiCl}$ improves the quality and yield of the polymer
(iv) $\mathrm{Me}_3 \mathrm{SiCl}$ acts as a catalyst during polymerisation
on oxymercuration-demercuration produces the major product :
ZSM - 5 is a/an :
Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding
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Silicates - 1
A large number of silicates minerals exist in nature. Some of the examples are feldspar, zeolites, mica and asbestos. The basic structural unit of silicates is SiO44– in which silicon atom is bonded to four oxygen atoms in tetrahedron fashion. In silicates either the discrete unit is present or a number of such units are joined together via corners by sharing 1,2,3 or 4 oxygen atoms per silicate units. When silicate units are linked together, they form chain, ring, sheet or three-dimensional structures. Negative charge on silicate structure is neutralised by positively charged metal ions. If all the four corners are shared with other tetrahedral units, three-dimensional network is formed. Two important man-made silicates are glass and cement.
Silicates - 2
Chain silicates
Chain silicates are formed by sharing two oxygen atoms by each tetrahedral. Anions of chain silicate have two general formula, i.e, (SiO3)n2n- and (Si4O11)n6n-.
Two-dimensional silicates
In such silicates 3-oxygen atoms of each tetrahedral are shared with adjacent SiO44- tetrahedral. Such sharing forms 2-D sheet structure as shown below.
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