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Oxidation no. Of p in mg2 p2o7 is

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Mg has o.n. = +2 and O has o.n. = -2  

( 2x2 ) + 2x + ( 7 x -2) = 0  

4 + 2x - 14 = 0  

2x = 10  

x = +5 ( o.n. of P)

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