Practice question

MCQ

Question

What is the oxidation number of chlorine in HClO₄?

Choose one · Correct answer highlighted

+5 +1 +7 Correct -1

Let Cl = x. H = +1, O = -2. Equation: +1 + x + 4(-2) = 0, 1 + x - 8 = 0, x = +7.

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