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Q.

P4 undergoes disproportionation in basic medium to give PH3(phosphine) and H2PO2⊝ (dihydrogen hypophosphite ion). Atomic weight of P is 31. Equivalent weight of P4 is _____.

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answer is 41.33.

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Detailed Solution

P4→4H2PO2θ+4e−×312e−+P4→4PH312P4→4H2PO2⊖+4PH3Total change in number of electrons - 12 Valency factor =124=3EW=MwP43∴EW=4×313=41.33g
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P4 undergoes disproportionation in basic medium to give PH3(phosphine) and H2PO2⊝ (dihydrogen hypophosphite ion). Atomic weight of P is 31. Equivalent weight of P4 is _____.