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Question:

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

A mixture of O2 and N2

Moist O2

Dry O2

O2 in the presence of aqueous NaOH

Solution:

P4 + 3O2 → P4O6
White phosphorus on reaction with a limited supply of oxygen gives lower oxide, P4O6. Therefore, air (O2 + N2) is a good source for the controlled supply of oxygen and the best choice for controlled oxidation of white phosphorus into lower oxide. Hence, option B is correct.