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`.

A

`H_(2)SO_(4),Al`

B

`HCl`,carbon

C

`H_(2)SO_(4),Mg`

D

`HCl,Fe`

Text Solution

Verified by Experts

The correct Answer is:

C

`Na_(2)B_(4)O_(7)+H_(2)SO_(4)+5H_(2)OtoNa_(2)SO_(4)+4H_(3)BO_(3)`
`2H_(3)BO_(3)toB_(2)O_(3)+3H_(2)O`
`B_(2)O_(3)+3Mg to 2B+3MgO`

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