Which one of the following is a heterogeneous mixture: fog, gasoline, aluminum-magnesium alloy (made by melting these metals together), mixture of \(\mathrm{N}_{2}(g)\) and \(\operatorname{Ar}(g)\) ?

A heterogeneous mixture is a mixture that has different components that are not evenly distributed throughout the mixture. This means that it is possible to see or separate the individual parts of the mixture.

Let's analyze each option to determine if it's a heterogeneous mixture: 1. Fog: Fog is a mixture of tiny water droplets suspended in the air, making it homogeneous as the water droplets are evenly distributed throughout. You cannot see or separate the different components of fog. 2. Gasoline: Gasoline is a single liquid composed of a mixture of different hydrocarbons, and these hydrocarbons are uniformly distributed throughout the liquid. So, gasoline is a homogeneous mixture, as well. 3. Aluminum-Magnesium Alloy: An alloy is a mixture of two or more metals combined together in a uniform manner, usually by melting the metals together. In the case of the aluminum-magnesium alloy, both metals are evenly distributed through the alloy, forming a homogeneous mixture. 4. Mixture of \(\mathrm{N}_{2}(g)\) and \(\operatorname{Ar}(g)\): This is a mixture of nitrogen gas and argon gas. Since both are gases, they will undergo massive diffusion and mix thoroughly, making it homogeneous as well. Conclusion: None of the given mixtures is a heterogeneous mixture. It seems like there is a mistake in the original exercise. If there were a heterogeneous mixture to choose from, we would be looking for a mixture with unevenly distributed components that can be separated easily.