What does this tell you about the rate of diffusion of hydrogen, compared to the gases in the air?

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   

Reaction type : double replacement hcl + lioh = h2o + licl

It can be classified based on its