40% aqueous solution of formaldehyde is called:

Explanation

Formaldehyde (HCHO) is a colorless gas with a pungent odor. It is used in a variety of industrial processes and is also used as a disinfectant and preservative. However, it is highly toxic and can cause respiratory irritation, skin irritation, and other health problems. To make it easier and safer to handle, formaldehyde is often dissolved in water to form a solution called formalin. Formalin is a clear, colorless liquid that contains about 40% formaldehyde by volume and also contains small amounts of methanol as a stabilizer. Formalin is commonly used as a disinfectant, as a fixative in histology and pathology, and as a preservative for biological specimens. It is also used in the production of resins, plastics, and textiles.