# 7.31     What are the oxidation states of phosphorus in the following:              $H_{3}PO_{_{3}}$

It is known that the oxidation state of H = 1 and O is -2.
Let the oxidation state of $P$ be x

$\\3 + x + 3(-2) = 0\\ 3 + x - 6 = 0\\ x - 3 = 0\\ x = 3$

hence oxidation state of $H_{3}PO_{_{3}}$ is  3

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