1.

Amorphous boron is extracted from borax by following steps. "Borax" overset((A))(rarr)H_3BO_3overset((B))(rarr) B_2O_3 overset((C))(rarr) "Boron" (A) and (C) are

Answer»

`H_2SO_4, Al`
`HCl , C`
`H_2SO_4, Mg`
`HCl, Fe`

SOLUTION :`Na_2B_4O_7 + 2H_2SO_4 to Na_2SO_4 + H_2B_4O_7`
`H_2B_4O_7 + 5H_2O to 4H_3BO_3`
`3H_4BO_3 overset("HEAT (B)")(rarr)B_2O_3 + 3H_2O`
`B_2O_3 + overset((C))(3 Mg) rarr 2B + 3MgO`.


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