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  4. The molecular formula of metaphosphoric acid is

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Q. The molecular formula of metaphosphoric acid is

TS EAMCET 2020

Solution:

The molecular formula of metaphosphoric acid is $HPO _{3}$. It's structure can be given as:
image
It has general formula $\left( HPO _{3}\right)_{n}$.
where, $n$ denotes number of phosphoric acid units present in the ring, with $n=3$ or more.
In metaphosphoric acid oxidation state of phosphorus is $+5$ with less number of $H$-atoms.