Amorphous boron is prepared by heating B 2 O 3 withA- MnB- HgC- SiO 2D- Mg

The correct option is D Mg(Boric oxide)B_2O_3+ 3Mg 3MgO +(Boron)2B ...

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Preparations and Reactions of Sodium Oxide

Amorphous bor...

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Amorphous boron is prepared by heating $B_{2} O_{3}$ with

M n

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H g

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M g

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S i O_{2}

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Amorphous boron on heating in air and with nitrogen produces:

B o r a x (A) \to H_{3} B O_{3} H e a t \to B_{2} O_{3} (B) \to B o r o n

(A)

(B)

1500^{o} C

{0.4 k c a l m o l}^{- 1}

{k c a l m o l}^{- 1}

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