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Chemistry
Amorphous boron on burning in air forms
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Q. Amorphous boron on burning in air forms
The p-Block Elements
A
B$(OH)_{3}$
12%
B
Mixture of $B_{2}O_{3}$ and $BN$
41%
C
Only $B_2O_3$
43%
D
Only $BN$
4%
Solution:
$4B +3O_{2} \xrightarrow{1173\, K} 2B_{2}O_{3}$
$2B(s) +N_{2}(g) \xrightarrow{1173\, K} 2BN(s)$