Please help! Which of the following ions is in the highest oxidation state?

A. P in H2PO- 4
B. Fe in Fe2O3
C. Cr in Cr2O2- 7

In an oxidation-reduction reaction, oxidation is what happens when a reactant

The pressure inside a hydrogen-filled container was 2.10 atm at 21 ? c. what would the pressure be if the container was heated to 92 ? c ?

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.