What must be combined with a halogen to give it a positive oxidation number?

What must be combined with a halogen to give it a positive oxidation number?

  • Correct Answer: carbon
  • nitrogen
  • calcium
  • oxygen

Explanation: Halogens (Cl, Br, I) have negative oxidation numbers when they form halide compounds. When combined with oxygen, they have positive numbers. In the chlorate ion (ClO 3 - ), the oxidation number of Cl +5, and the oxidation number of O is -2.

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