Question
Question: Moissan boron is....
Moissan boron is.
A
Amorphous boron of ultra purity
B
Crystalline boron of ultra purity
C
Amorphous boron of low purity
D
Crystalline boron of low purity
Answer
Amorphous boron of low purity
Explanation
Solution
Moissan boron is amorphous boron, obtained by reduction of 
with Na or Mg. It has 95-98% boron and is black in colour.