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  4. The oxidation number of P in Mg2P2O7 is

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Q. The oxidation number of $P$ in $Mg_{2}P_{2}O_{7}$ is

Redox Reactions

Solution:

$\overset{+2}{Mg_{2}}\, \overset{x}{P_{2}} \, \overset{-2}{O_{7}}$ i.e., $2 (+2) + 2(x) + 7 (-2) = 0$
$\Rightarrow x = +5$