question: When iron rusts, it becomes what on the surface?
choices.text: osculum a metal black pink Elemental invisible hued orange
choices.label: A B C D E F G H
fact2: Chemically, iron is an active metal.
combinedfact: when iron rusts it becomes orange on the surface
formatted_question: When iron rusts, it becomes what on the surface? (A) osculum (B) a metal (C) black (D) pink (E) Elemental (F) invisible (G) hued (H) orange