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Q. White phosphorus catches fire in air to produce dense white fumes. This is due to the formation of

KVPYKVPY 2017The p-Block Elements

Solution:

White phosphorus is highly reactive and catches fire when exposed to air and produces white dense fumes of phosphorus oxide,
$P_{4}O_{10}$. $P_{4} + 5O_{2}\rightarrow P_{4}O_{10}$