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Question 1 of 30
What is formaldehyde and where is it commonly found?
A. A colorless, strong-smelling gas found in aqueous solutions and commonly used as a preservative.
B. A gaseous element that is a component of air, found in very low concentrations.
C. A solid crystalline substance used primarily in industrial cleaning agents.
D. A liquid compound that is a byproduct of combustion, found in vehicle exhaust.