Amorphous boron on burning in air forms :

B (O H)_{3}

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mixture of

B_{2} O_{3}

and

B N

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only

B_{2} O_{3}

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only

B N

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Solution

The correct option is A mixture of $B_{2} O_{3}$ and $B N$
Amorphous boron on burning in the air gives a mixture of boron trioxide and boron nitride. Boron burns with a brilliant flame in oxygen.
The reaction can be given as follow:
$4 B + 3 O_{2} \to 2 B_{2} O_{3}$
$2 B + N_{2} \to 2 B N$

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