Question

The compound(s) which react(s) with NH₃ to give boron nitride (BN) is (are):

Options

• B

• B₂H₆

• B₂O₃

• HBF₄

Answer 1

B, B₂H₆ and B₂O₃

Explanation:

1. \[\ce{\underset{(Amorphous)}{B} + NH3 ->[Very high temp] BN + H2}\]

2. \[\ce{B2H6 + \underset{(Excess)}{NH3} -> (BN)_X}\]

3. \[\ce{B2O3 + 2NH3 ->[600^\circ C] 2BN + 3H2O}\]

4. \[\ce{HBF4 + NH3 -> [NH4]^\oplus [BF4]^0}\]