Question
Explain:
- Cyclic silicates
- Ino silicates
✓
Answer
1. Cyclic silicates:
Silicates which contain $\left( SiO _3\right)_n^{2 n-}$ ions which are formed by linking three or more tetrahedral $\left( SiO _3\right)_n^{4-}$ units cyclically are called cyclic silicates. Each silicate unit shares two of its oxygen atoms with other units.
Example:
Beryl $\left[ Be _3 Al _2\left( SiO _3\right)_6\right]$ (an aluminosilicate with each aluminium is surrounded by 6 Structure of Cyclic silicates
2. Ino silicones:
Silicates which contain $V$ number of silicate units liked by sharing two or more oxygen atoms are called inosilicates. They are further classified as chain silicates and double chain silicates. Chain silicates (or pyroxenes) - These silicates contain $\left( SiO _3\right)_n^{2 n-}$ ions formed by linking ' $n$ ' number of tetrahedral $\left( SiO _3\right)_n^{4-}$ units linearly. Each silicate unit shares two of its oxygen atoms with other Structure of Chain silicates units.
Example:
Spodumene - $LiAl \left( SiO _3\right)_2$ Double chain silicates (or amphiboles) - These silicates contains $\left[ Si _4 O _{11}\right]_n^{6 n-}$ ions. In these silicates there are two different types of
3. Tetrahedra:
1. Those sharing 3 vertices
2. Those sharing only 2 vertices.
Examples.
Asbestos - These are fibrous and noncombustible silicates. Therefore they are used for thermal insulation material, brake linings, construction material and filters. Asbestos being carcinogenic silicates, their applications are restricted.
Silicates which contain $\left( SiO _3\right)_n^{2 n-}$ ions which are formed by linking three or more tetrahedral $\left( SiO _3\right)_n^{4-}$ units cyclically are called cyclic silicates. Each silicate unit shares two of its oxygen atoms with other units.
Example:
Beryl $\left[ Be _3 Al _2\left( SiO _3\right)_6\right]$ (an aluminosilicate with each aluminium is surrounded by 6 Structure of Cyclic silicates
2. Ino silicones:
Silicates which contain $V$ number of silicate units liked by sharing two or more oxygen atoms are called inosilicates. They are further classified as chain silicates and double chain silicates. Chain silicates (or pyroxenes) - These silicates contain $\left( SiO _3\right)_n^{2 n-}$ ions formed by linking ' $n$ ' number of tetrahedral $\left( SiO _3\right)_n^{4-}$ units linearly. Each silicate unit shares two of its oxygen atoms with other Structure of Chain silicates units.
Example:
Spodumene - $LiAl \left( SiO _3\right)_2$ Double chain silicates (or amphiboles) - These silicates contains $\left[ Si _4 O _{11}\right]_n^{6 n-}$ ions. In these silicates there are two different types of
3. Tetrahedra:
1. Those sharing 3 vertices
2. Those sharing only 2 vertices.
Examples.
Asbestos - These are fibrous and noncombustible silicates. Therefore they are used for thermal insulation material, brake linings, construction material and filters. Asbestos being carcinogenic silicates, their applications are restricted.
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