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Q.

Amorphous boron on burning in air forms

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a

$B {(OH)}_{3}$

b

Mixture of $B_{2} O_{3}$ and BN

c

Only $B_{2} O_{3}$

d

Only BN

answer is B.

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Detailed Solution

$4 B + 3 O_{2} \overset{1173 K}{\to} 2 B_{2} O_{3} 2 B (s) + N_{2} (g) \overset{1173 K}{\to} 2 BN (s)$

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