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Q. When conc. $H_2SO_4$ is heated with $P_2 O_5$, the acid is converted into

KCETKCET 2007The p-Block Elements - Part2

Solution:

When cone. $H_2SO_4$ is heated with $P_2O_5$, the acid is converted into sulphur trioxide.

$2H_2SO_4 + 2P_2O_5 \rightarrow \underset{\text{ sulphur trioxide}}{ 2SO_3 } + 4HPO_3$