Amorphous boron of `95%` to `98%` purity is obtained by:
Amorphous boron of `95%` to `98%` purity is obtained by:
A. heating `B_(2)O_(3)` with `H_(2)`
B. heating `B_(2)O_(3)` with `Mg` or `Na` at high temperature.
C. heating `KBF_(4)` with `Na` or `K`.
D. heating `BBr_(3)` with `H_(2)` in presence of a catalyst.
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Correct Answer - B
`B_(2)O_(3)+3Mg` or `Naunderset(Delta)overset("High temperature")to2B+3MgO //Na_(2)O`
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