Which of the following does not describe a physical property of iron? A
Iron is silvery-white or gray in color.

B
Iron has a boiling point of about 3,000°C.

C
Iron is a magnetic element.

D
Iron and sulfur react to form iron sulfide.

A.

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf