Soda water is an example of a solution where carbon dioxide gas is dissolved in water, which is a liquid. This kind of solution is classified as gas in liquid. In chemistry, solutions are homogeneous mixtures composed of two or more substances. The substance that is present in a lesser amount and is dissolved is called the solute, and the substance in which the solute is dissolved is called the solvent. For soda water, the solute is the carbon dioxide gas, and the solvent is water. Therefore, the correct answer is Gas in liquid.