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

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Q. The reaction of $P_4$ with X leads selectively to $P_4O_6$. The X is

UPSEEUPSEE 2019

Solution:

When phosphorous is burnt in limited supply of air, formation of $P_4O_6$ occur.
$\because \ce{P4 +air -> P4O6}$
$\therefore \ce{P4 +3O2 + N2 -> P4O6 +N2}$
Nitrogen is used here to retard the further oxidation.