Which of the following is a colorless, inflammable liquid used as a solvent?

Acetone is indeed a colorless, inflammable liquid widely recognized for its properties as an effective solvent. It is commonly used in various cosmetic and beauty applications, particularly for removing nail polish and assisting in various cleaning processes associated with cosmetology. Acetone's volatility and ability to dissolve a wide range of substances make it particularly valuable in the industry.

While other substances like alcohol can also serve as solvents and have colorless properties, acetone stands out due to its specific characteristics that relate directly to its use in professional settings involving nail products and similar applications. Additionally, acetone's quick evaporation rate makes it practical for use in various formulations and solutions within the cosmetology field.

Mineral oil, on the other hand, is typically not classified as a solvent but rather as an emollient or lubricant, affecting its utility in this context. Propylene glycol is more commonly used as a humectant rather than a primary solvent. Thus, the unique attributes of acetone align perfectly with the requirements of a colorless, inflammable liquid used specifically as a solvent in cosmetics and related practices.