First slide

13th group or boron group

Question

Which of the following method can be used for the preparation of purest Boron ?

Difficult

A

$\underset{g}{2 B C l_{3}} + \underset{g}{3 H_{2}} \overset{1270 K}{\to} 2 \underset{S}{B} + 6 H C l_{(g)}$
B

$B_{2} O_{3} + 3 M g \to 2 B + 3 M g O$
C

$2 B C l_{3} \overset{1173 K}{\to} 2 B + 3 C l_{2}$
D

Electrolysis fused $K B F_{4}$

Solution

Small amounts of pure crystalline boron may be obtained by the following reactions.
$\begin{array}{l} B X_{3} + H_{2} \to_{1270 K}^{W} B + H X \\ B I_{3} \overset{Δ}{\to} B + I_{2} \\ B_{2} H_{6} \to B + H_{2} \end{array}$

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