Answer
$B_{2}O_{3}$, Oxidation state of B is +3
Work Step by Step
Net oxidation state of the compound is 0, hence:
O: -2 x 3 = -6, hence B should have oxidation state of +3 (+3 x 2 = +6).
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.