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 formA. `SiO_(2)`B. `SiO_(2)^(2-)`C. `SiO_(3)^(2-)`D. `SiO`

Silicon. The element silicon has two allotropic modification (a) Amorp

1.	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 formA. `SiO_(2)`B. `SiO_(2)^(2-)`C. `SiO_(3)^(2-)`D. `SiO`
Answer» Correct Answer - C

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