Phosphine (IUPAC name: phosphane) is a colorless, flammable, highly toxic compound with the chemical formula PH3, classed as a pnictogen hydride.
The lone pair is responsible for asymmetrical charge distribution and hence, PH3 is a polar molecule with non-polar covalent bonds.
With traces of P 2H 4 present, PH 3 is spontaneously flammable in air (pyrophoric), burning with a luminous flame. Phosphine is a highly toxic respiratory poison, and is immediately dangerous to life or health at 50 ppm.
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