Boron of highest purity (~99.9%) is obta...

Boron of highest purity `(~99.9%)` is obtained by

reduction of `B_(2)O_(2)` by `Mg`.

electrolysis of fused tetrafluoroborates `(KBF_(4))` in molten `KF`.

reduction of `BCl_(3)` with `H_(2)` at `1270 K`.

thermal decomposition of boranes at `1173 K`.

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The correct Answer is:

Boron of maximum purity `(~99.9%)` is obtained by the reduction of `BCl_(3)` with `H_(2)` at `1270 K`.

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