Which of the following electropositive metal is generally used for the isolation of boron from \...

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Which of the following electropositive metal is generally used for the isolation of boron from \( \mathrm{B}_{2} \mathrm{O}_{3} \) ?
(A) \( \mathrm{Al} \)
(B) \( \mathrm{Mg} \)
(C) \( \mathrm{Zn} \)
(D) Pt.
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