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p-Block Elements – I — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12Chemistryp-Block Elements – I1 Mark
Question
How will you convert boric acid to boron nitride?
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Answer

Fusion of urea with boric acid $B ( OH )_3$, in an atmosphere of ammonia at $800-1200 K$ gives
$\underset{\text { (Boric acid) }}{ B ( OH )_3}+ NH _3 \stackrel{\Delta}{\longrightarrow} \underset{\text { (Boron nitride) }}{ BN }+3 H _2 O$

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