Which of the following layers of the earth was divided into two, the inner and outer core? a. mantle
b. core
c. crust
d. none​

The mantle was divided into two

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