Question

NH3 can be liquified easily but PH3 can not. why?

Answer 1

because NH3 has a property of isomerism but PH3 dont have this property

Answer 2

NH3 ammonia contains inter molecular hydrogen bonding whereas the PH3 is gas because this do nothave any hydrogen bond^_^ Because of intermolecular hydrogen bonding in NH3 while it is not present in PH3. ... NH3 makes hydrogen bonding but PH3 doesn't and hence NH3 is liquid but PH3 is not.