[DCE 2003]
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
Moissan boron is amorphous boron, obtained by reduction of $ B_2O_3 $ with Na or Mg. It has 95-98% boron and is black in colour.
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