JEE Main Chemistry question

Pure boron is best prepared by

(A)Heating with
(B)Heating with Na and K
(C)Heating with Na or K
(D)Heating with in presence of a catalystCorrect

Answer: (D)

Solution

Ultra-pure, crystalline boron is obtained by thermal/catalytic reduction of volatile vapour with (deposited on a heated filament), avoiding the impurities left behind by bulk metal-reduction routes.

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Question ID VK-138339