1. Sea water:
– Solution. Sea water is a homogeneous mixture where salt (and other dissolved substances) is uniformly distributed in water.

2. Soda water:
– Solution. Soda water is a homogeneous mixture of carbon dioxide gas dissolved in water, along with other additives.

The other mixtures are not solutions:

– Soil:
– Heterogeneous mixture. Soil is composed of a variety of particles such as minerals, organic matter, water, and air, and it does not have a uniform composition.

– Air:
– Homogeneous mixture. While air is a mixture of gases, it is considered homogeneous because the gases are uniformly distributed throughout the atmosphere.

– Coal:
– Heterogeneous mixture. Coal consists of a variety of substances, including carbon, hydrogen, sulfur, and other elements, and its composition is not uniform.

So, sea water and soda water are the solutions in this list.