Question

How will you convert boric acid to boron nitride?

Answer 1

Fusion of urea with boric acid B(OH)₃, in an atmosphere of ammonia at 800 – 1200 K gives

\[\ce{\underset{\text{(Boric acid)}}{B(OH)3} + NH3 ->[\Delta] \underset{\text{(Boron nitride)}}{BN} + 3H2O}\]