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What is the oxidation state of oxygen in H₂O?

Answer and explanation

Correct answer: -2

H₂O is a neutral molecule, so the sum of oxidation states of all its atoms is 0. Hydrogen normally has an oxidation state of +1; therefore, 2(+1) + x = 0, giving x = -2 for oxygen. The oxidation state -1 occurs for oxygen in peroxides, such as H₂O₂. Exam tip: In a neutral compound, the sum of oxidation states is always 0.

Related tags

Oxidation NumberOxygen Oxidation StateWaterRedox ReactionsClass 11 ChemistryOxidation Number And Rules For AssignmentChemistryClass 11 Mcq

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