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Silicon. The element silicon has two all...

Silicon. The element silicon has two allotropic modification (a) Amorphous silicon (b) Adamantine silicon. A third allotropic modification has been observed and is of doubtful character known as graphitoidal silicon. Amorphous silicon is obtained by heating well-powdered quartz of finely silica with magnesium powder in a fireclay which is suitable for the manufacute of crucibles.
`SiO_(2)+2Mg to Si+2MgO`
The product is washed with dilute HCl to wash away MgO and then with hydrofluoric acid to remove uncharged silica.
When silica is heated with carbon then silica is reduced to

A

Si

B

SiO

C

`SiO_(3)^(2-)`

D

SiC

Text Solution

Verified by Experts

The correct Answer is:
D
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Silicon. The element silicon has two allotropic modification (a) Amorphous silicon (b) Adamantine silicon. A third allotropic modification has been observed and is of doubtful character known as graphitoidal silicon. Amorphous silicon is obtained by heating well-powdered quartz of finely silica with magnesium powder in a fireclay which is suitable for the manufacute of crucibles. SiO_(2)+2Mg to Si+2MgO The product is washed with dilute HCl to wash away MgO and then with hydrofluoric acid to remove uncharged silica. Silicon reacts with fused aqueous NaOH to form

Silicon. The element silicon has two allotropic modification (a) Amorphous silicon (b) Adamantine silicon. A third allotropic modification has been observed and is of doubtful character known as graphitoidal silicon. Amorphous silicon is obtained by heating well-powdered quartz of finely silica with magnesium powder in a fireclay which is suitable for the manufacute of crucibles. SiO_(2)+2Mg to Si+2MgO The product is washed with dilute HCl to wash away MgO and then with hydrofluoric acid to remove uncharged silica. Crystalline silicon may be obtained by heating potassium silicon fluoride with

Silicones

Silicon is a

Silicones are

Silicones are

Pure Boron & silicon can be obtained by