A) amorphous boron of ultra purity
B) crystalline boron of ultra purity
C) amorphous boron of low purity
D) crystalline boron of low purity
Correct Answer: C
Solution :
Moissan boron, which is an amorphous low purity boron, is made by reduction of boric oxide with magnesium. Boron obtained has 86% purity & is amorphous.
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