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Question:

The reaction of P4 with X leads selectively to P4O6. The X is:

dry O2

moist O2

O2 in presence of aq. NaOH

a mixture of O2 and N2

Solution:

Phosphorus trioxide (P4O6) is prepared by heating phosphorus in the limited supply of oxygen and nitrogen. P4 + 3O2 + N2 → P4O6. N2 prevents further oxidation of P4O6 to P4O10.