Practice question

MCQ

Question

What is the oxidation number of selenium in H₂SeO₃?

Choose one · Correct answer highlighted

+6 +4 Correct +2 -2

Let Se = x. H = +1, O = -2. Equation: 2(+1) + x + 3(-2) = 0, 2 + x - 6 = 0, x = +4.

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