What is the oxidation number of oxygen in hydrogen peroxide (H2O2)?
Answer and explanation
Correct answer: B. -1 oxidation state
In peroxides containing an O-O single bond such as H2O2, each hydrogen is +1 (total +2). For the neutral molecule, the two oxygen atoms must total -2, meaning each oxygen has an oxidation number of -1. In ordinary oxides it is -2; in OF2 it is +2.
Practise more Chemical Thermodynamics, Kinetics, and Equilibrium.
Free questions with an explanation for every one, and full timed Medical University Entrance Examination (Bulgaria) mock tests.
More Chemical Thermodynamics, Kinetics, and Equilibrium questions
- What thermodynamic criterion determines whether a chemical process is spontaneous at constant temperature and pressure?
- Under which thermodynamic conditions is a chemical reaction spontaneous at all temperatures?
- How does adding a chemical catalyst accelerate the rate of a chemical reaction?
- What are the units of the rate constant (k) for a second-order chemical reaction?
- If doubling the concentration of reactant A quadruples the initial rate of reaction, what is the reaction order with respect to A?
- According to the Arrhenius equation (k = A * e^(-Ea / RT)), what graph yields a straight line whose slope equals -Ea / R?