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Question:

The reaction of white phosphorus with aqueous NaOH gives phosphine along with another phosphorus-containing compound. The reaction type, the oxidation states of phosphorus in phosphine and the other product are respectively:

redox reaction;+3and+5

disproportionation reaction;𕒷and+5

disproportionation reaction;𕒷and+3

redox reaction;𕒷and𕒹

Solution:

P₄ + 3NaOH + 3H₂O → PH₃ + 3NaH₂PO₂
The salt NaH₂PO₂ undergoes the following changes on heating.