Oxidation Number and Rules for Assigning Oxidation Numbers

Chemistry ⇒ Redox Reactions and Electrochemistry

Oxidation Number and Rules for Assigning Oxidation Numbers starts at 10 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Oxidation Number and Rules for Assigning Oxidation Numbers. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 10

A compound contains 2 atoms of element X and 3 atoms of oxygen, and the compound is neutral. If the oxidation number of oxygen is -2, what is the oxidation number of X in X₂O₃?

Calculate the oxidation number of chromium in K₂Cr₂O₇.

Calculate the oxidation number of each oxygen atom in O₂F₂.

Calculate the oxidation number of nitrogen in NO₃^-.

Calculate the oxidation number of phosphorus in PO₄^3-.

Determine the oxidation number of chlorine in Cl₂O₇.

Determine the oxidation number of chromium in Cr₂O₇^2-.

Determine the oxidation number of manganese in MnO₄^-.

Determine the oxidation number of sulfur in H₂SO₄.

Explain why the oxidation number of oxygen in most compounds is -2, but in peroxides it is -1.

In the compound CaCl₂, what is the oxidation number of calcium?

In the compound H₂O₂, what is the oxidation number of each oxygen atom?

In the compound NaCl, what is the oxidation number of chlorine?

In the ion Fe³⁺, what is the oxidation number of iron?

In the ion SO₃^2-, what is the oxidation number of sulfur?

What is the oxidation number of carbon in CO₂?

What is the oxidation number of hydrogen in H₂O?

What is the oxidation number of potassium in KMnO₄?

Assign oxidation numbers to all atoms in the ion C₂O₄^2- (oxalate ion).

Assign the oxidation number to each element in the compound Na₂S₂O₃.