How many acid washing steps are required in the extraction process of amorphous silicon ?

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Solution

The correct option is C 2
Finely powdered silica (sand or quartz) is mixed with magnesium powder and heated in a fire- clay crucible. Magnesium oxide and silicon are formed. The product is washed with dilute hydrochloric acid to dissolve magnesium oxide, a basic impurity. Then it is washed with hydrofluoric acid to remove unreacted silica. The powder left behind is silicon its amorphous form.
$S i O_{2} + 2 M g ⟶ S i + 2 M g O$
Hydrochloric acid is used to dissolve magnesium oxide, a basic impurity. Hydrofluoric acid is used to remove silica by washing. So, two acid washing steps are required in the extraction process of amorphous silicon.

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B o r a x (A) \to H_{3} B O_{3} H e a t \to B_{2} O_{3} (B) \to B o r o n

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