Solution can be prepared by not only adding solute to solvent always. It can also be a combination of solid or gas in a solvent. On food industry, most of the softdrinks are available in the form of carbonated beverages. These are gas in liquid media. Similarly, dissolution of alcohol in water is example of liquid-liquid solution and Salt in water is solid-liquid solution. Many factors affects the solubility like particle size, temperature, chemical structure, dielectric constant etc. In order to make a pharmaceutical solution compatible with the biological environment many other additives are also used. This MCQ will give a brief idea about solutions used in pharmaceutical.