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Amorphous boron is extracted from borax ...

Amorphous boron is extracted from borax by the following steps :
`"Borax" overset((A))rarr H_(3) BO_(3) overset("Heat")rarr B_(2) O_(3) overset((B)) rarr "Boron" (A) and (B) are`
(a) `H_(2) SO_(4), Al`
(b) `HCl`, Carbon
( c) `H_(2) SO_(4), Mg`
(d) `HCl, Fe`.

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