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# What are the oxidation states of phosphorus:

7.31     What are the oxidation states of phosphorus in the following:

$Ca_{3}P_{2}$

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We know that the oxidation state of  calcium is +2
let oxidation state $P$ be $x$
$\\3(+2) + 2(x) = 0\\ 6 + 2x = 0\\ 2x = -6\\ x = -6 / 2\\ x = -3$

Hence the oxidation state of the phosphorus is -3

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