p-Block elementsHard

Question

Crystalline boron in small amounts may be obtained by :

Options

A.reducing BCl3 with H2
B.pyrolysis of BiI3
C.thermal decomposition of diborane
D.all of these

Solution

(a) 2BX3 + 3H2 2B + 6HX    (X = Cl or Br)
(b) 2Bl3 2B + 3I2.        (Van Arkel mehod).
(c) B2H6 2B + 3H2.

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