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.
Frequently asked questions
What is the correct answer to this question?
-2
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Redox Reactions. Topic: Oxidation number and rules for assignment.
