The gases are present in the atmosphere and comprise various gases in different proportions. Oxygen gas is a solute in a homogeneous mixture of gases. Thus, option A is correct.
Mixtures are of two types namely, homogenous and heterogeneous. The combination of the mixture of two or more solutes distributed uniformly and evenly is called a homogeneous mixture.
The homogeneous mixture has the same composition and distribution of the solute in the solution and can be best described by the atmospheric gases.
Oxygen is a solute present along with the elemental nitrogen in the atmosphere in an even distribution along with the same state of matter and phase.
Therefore, oxygen is a solute distributed in a mixture.
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Your question is incomplete, but most probably your full question was,
What is the oxygen in the air we breathe classified as?
A) The solute in a homogeneous gas mixture.
B) The solvent in a homogeneous gas mixture.
C) The solute in a heterogeneous gas-liquid mixture.
D) The solvent in a simple mixture.
E) None of the above
