The correct answer is: A. Liquid in liquid.
An emulsion is a mixture of two or more immiscible liquids, one of which is dispersed in the other in the form of small droplets. The dispersed phase is usually a liquid, but it can also be a solid or a gas. The continuous phase is the liquid that surrounds the droplets of the dispersed phase.
Emulsions are stabilized by emulsifiers, which are substances that reduce the surface tension between the two liquids. Emulsifiers can be either natural or synthetic. Natural emulsifiers include proteins, phospholipids, and gums. Synthetic emulsifiers include detergents and wetting agents.
Emulsions are used in a variety of products, including cosmetics, food, and pharmaceuticals. They are also used in industrial processes, such as the production of paints and inks.
Here is a brief explanation of each option:
- Option A: Liquid in liquid. This is the correct answer. An emulsion is a mixture of two or more immiscible liquids, one of which is dispersed in the other in the form of small droplets. The dispersed phase is usually a liquid, but it can also be a solid or a gas. The continuous phase is the liquid that surrounds the droplets of the dispersed phase.
- Option B: Solid in liquid. This is not the correct answer. A solid in liquid solution is a mixture of a solid and a liquid, where the solid is dissolved in the liquid.
- Option C: Gas in solid. This is not the correct answer. A gas in solid solution is a mixture of a gas and a solid, where the gas is dissolved in the solid.
- Option D: Solid in solid. This is not the correct answer. A solid in solid solution is a mixture of two or more solids, where one solid is dissolved in the other solid.