Powdered sulfur is yellow, and powdered iron is gray. when powdered sulfur and powdered iron are mixed at 20°c, the powdered iron (a) becomes yellow (b) remains ionic (c) becomes a liquid (d) remains magnetic

The correct answer is D. remains magnetic.

 When powdered iron and powdered sulfur are mixed at 20degrees Celcius the powdered iron will remain magnetic. Iron powder is used in the production of magnetic alloys and other certain types of steels.
 As a whole iron, its formed from other several iron particles. Iron powder is classified into atomized powder, electrolyte iron powder, and reduced iron powder.