Question

$B$ can be obtained from halide by van-Arkel method. This involves reaction :

• A. $2B{I}_3\underset{\text{filament}}{\overset{\text{Red hot W or Ta}}{\to }}2B+3I_2$
• B. $2B{Cl}_3+3H_2\underset{\text{filament}}{\overset{\text{Red hot W or Ta}}{\to }}2B+6HCl$
• C. both (A) and (B)
• D. none of the above

Answer 1

The correct option is A $2B{I}_3\underset{\text{filament}}{\overset{\text{Red hot W or Ta}}{\to }}2B+3I_2$

According to Van-Arkel method, pyrolysis of $B{I}_3$ is carried out in the presence of red hot $W$ or $Ta$ filament.
$2B{I}_3\stackrel{\text{Red hot W or Ta filament}}{\to }2B+3I_2$