Question

the color of a substance depends not only on the oxidation state of the atoms, but also on the structure. a solution of k2cro4 is yellow and a solution of k2cr2o7 is orange. chromium has the same oxidation state in both compounds despite the difference in color. what is the oxidation state of chromium?

Answer 1

Chromium has the same oxidation state in both compounds despite the difference in color, the oxidation state of chromium is  +6.

When a molecule, atom, or ion loses electrons during a reaction, this is referred to as oxidation.

When the oxidation state of a molecule, atom, or ion increases, oxidation takes place. When an atom, molecule, or ion's oxidation status changes or more electrons are gained, the process is known as reduction.

An illustration of a reaction is the formation of hydrofluoric acid by the reaction of hydrogen and fluorine gas:

H2 + F2 → 2 HF

Hydrogen is being oxidized and fluorine is being reduced in this process. When stated as two half-reactions, the reaction might be easier to comprehend.

There is no oxygen present at any point in this reaction:

H2 → 2 H+ + 2 e-

F2 + 2 e- → 2 F-

Learn more about oxidation here:

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