How is phosphine prepard using the following reagents ? (a) `HCl` (b) – InterviewSolution

InterviewSolution

1.	How is phosphine prepard using the following reagents ? (a) `HCl` (b) `H_(2)SO_(4)` (c ) Caustic soda
Answer» (a) Calcium phosphide is mixed with dilute HCl. This results in the formation of phosphine. `{:(Ca_(3)P_(2)+6HCl to3CaCl_(2)+2PH_(3)),(" ""Calcium" " ""Calcium"" ""Phosphine"),(" ""Phosphide"" ""chloride"):}` (b) Aluminium phosphide is decomposed with dilute sulphuric acid. `{:(2AlP+3H_(2)SO_(4)to2PH_(3)+Al_(2)(SO_(4))_(3)),("Aluminium"" ""Phosphine"" ""Aluminium"),("phosphide" " ""sulphate"):}` (c) In the laboratory, phosphine is prepared by heating white phosphrus with concentrated NaOH solution in an inert atmosphere of `CO_(2).` `P_(4)+3NaOH+3H_(2)Oto underset("Phosphine")(PH_(3))+underset("Sodium hypophosphite")(3NaH_(2)PO_(2))`

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