Eyelash Extensions Written Practice Exam

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Which gas is colorless and has a sharp suffocating odor?

Ammonia
Formaldehyde
Chlorine
Hydrogen

The correct answer is: Formaldehyde

Formaldehyde is a colorless gas that is known for its pungent and sharp suffocating odor. It is commonly used in various industrial applications and in the preservation of biological specimens. In the context of eyelash extensions and beauty products, formaldehyde is often a concern because it can be released from certain adhesives and products, especially under certain conditions. This makes it important for professionals in the beauty industry to be aware of its presence and to follow safety protocols to minimize exposure. The other gases listed have distinct properties. Ammonia, while colorless and having a strong odor, is not classified as having a suffocating characteristic in the same way formaldehyde is perceived. Chlorine has a strong, irritating smell, but it is also distinctly greenish-yellow and not just colorless. Hydrogen, on the other hand, is colorless and odorless, which differentiates it significantly from formaldehyde. Understanding these properties helps in recognizing the implications for product safety and environmental controls in beauty practices.