Q.

Amorphous boron on burning in air forms

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a

BOH3

b

Mixture of B2O3 and BN

c

Only B2O3

d

Only BN

answer is B.

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Detailed Solution

4B  +   3O2  →1173  K  2  B2O3 2Bs   +   N2g   →1173  K  2BNs
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