No.
Air is an example of a mixture of gasses.
Brass is an example of a mixture of two solid metals.
No, only liquids. Most liquids can be separated by filtration those which can't are mostly separated by evaporation.
Immiscible liquids are to miscible liquids. Miscible liquids can mix evenly with each other to form a homogeneous mixture, whereas immiscible liquids cannot mix evenly and form a heterogeneous mixture with distinct layers.
A solution
Liquids in a mixture can have different densities, boiling points, solubilities, and polarities. These differences can result in liquids separating out from the mixture or forming layers based on their unique properties.
Fat
To be considered a solution, it has to be a homogeneous mixture. Where you have liquids, they may not dissolve into one another, such as water and oil, and you have a clear division where the liquids don't mix. Where as gases, is they are in a closed system, are homogeneous because there is nothing there to stop the molecules from occupying a relatively homogeneous arrangement.
mixture of polar and nonpolar liquids.
The mixture is homogeneous only when these liquids are miscible.
No, it is not two liquids. It is two types of mixtures.
The statement in the question is false. It is very common for two liquids to form a mixture that is also liquid, and, unless a chemical reaction occurs, a mixture of two gases always is also a gas.
A blended mixture of two or more solids, liquids, and/or gases is called a heterogeneous mixture.
When two liquids mix together and form a uniform solution, it is called a homogeneous mixture or solution. This occurs when the molecules of the two liquids are evenly distributed throughout the mixture.