Question

The molecular formula of metaphosphoric acid is

• A. $H_{3}P{O}_4$
• B. $HP{O}_3$
• C. $H_{2}P{O}_3$
• D. $H_{3}P{O}_2$

Answer 1

Answer: (B)

The molecular formula of metaphosphoric acid is $HP{O}_3$. It's structure can be given as:

It has general formula ${\left(HP{O}_3\right)}_n$.
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.