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Phosphine (spelled with 's' in 4th position) is phosphorus trihydride, PH3 (compare NH3).

It is a colorless, flammable, toxic gas.

Pure phosphine is odourless, but technical grade samples have a highly unpleasant odor like garlic or rotting fish, due to the presence of substituted phosphine and diphosphine (P2H4)

Phosgene is carbonyl dichloride, COCl2,

This very toxic, colorless gas.

It gained infamy as a chemical weapon duringWorld War I. In low concentrations, its odor resembles freshly cut hay or grass.

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Q: What is the difference between phosphine gas and phosgene gas?
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