Oxygen is not a mixture at all. It is simply a gas in it's purest form. Mixtures are made of liquids and solids.
Oxygen is a chemical compound, not a mixture.
Oxygen is a chemical element not a mixture.
Neither, Oxygen is a pure substance not a mixture.
An element
Neither. Oxygen is an element, which is a pure substance and not a mixture.
Neither. The condensation of oxygen gas is a phase change. The oxygen itself would be an element, not a mixture.
Heterogeneous mixture.
hetergeneous
A flower is a heterogeneous mixture.
Salad dressing is a heterogeneous mixture.
Heterogeneous mixture.
Smoke is heterogeneous mixture and is easily separable as it's main constituents are Carbon and Oxygen.