How to prepare amorphous boron from borax? Write equations?

1.	How to prepare amorphous boron from borax? Write equations?
Answer» Solution :Borax on hydrolysis with DILUTE acids GIVE boric acid. Boric acid on STRONG heating gives boric ANHYDRIDE. This boric anhydride on reduction with sodium or magnesium gives amorphous boron. `Na_2B_4O_7+2HCl +5H_2O to 2NaCl +4H_3BO_3` `2H_3BO_3 to^(Delta) B_2O_3+3H_2O,B_3O_3+3Mg to 2B+3MgO`

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