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Question

The reaction of P4 with X leads selectively to P4O6. The X is:
  1. dry O2
  2. a mixture of O2 and N2
  3. moist O2
  4. O2 in presence of aq. NaOH

A
dry O2
B
a mixture of O2 and N2
C
O2 in presence of aq. NaOH
D
moist O2
Solution
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Phosphorus trioxide (P4O6) is prepared by heating phosphorus in the limited supply of oxygen and nitrogen.

P4+3O2O2+N2−−−P4O6

N2 prevents further oxidation of P4O6 to P4O10.

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