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Question

The reaction of P4 with X leads selectively to P4O6. The X is:
  1. A mixture of O2 and N2
  2. Dry O2
  3. Moist O2
  4. O2 in the presence of aqueous NaOH

A
Dry O2
B
O2 in the presence of aqueous NaOH
C
A mixture of O2 and N2
D
Moist O2
Solution
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P4+3O2N2P4O6

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.

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