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Addition of Halogen Cyanide

What is the n...

Question

What is the necessary condition for the preparation of metaphosphoric acid by reaction of phosphorus acid with $B r_{2}$ ?

Simple heating

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Heating in a sealed tube

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Inert atmosphere

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None of these

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Solution

The correct option is B Heating in a sealed tube
Phosphorus acid on being heated with bromine in a sealed tube gives metaphosphoric acid.
$H_{3} P O_{3} + B r_{2} \to H P O_{3} + 2 H B r$

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