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a
20% pure amorphous boron
b
crystalline pure boron
c
95-98% pure amorphous boron
d
Black boron
answer is C.
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Detailed Solution
Moissan's boron is 95-98% pure as it extracted by reduction of boric anhydride by metals like Na,K,Mg.Their oxides dissolve in water or HCl yet some remain as impurity .