Calculate the oxidation number of underlined elements in the following compounds:
$K_{4} P_{2} - - O_{7}$

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Solution

The correct option is A 5
$K_{4} P_{2} - - O_{7}$
charge on $K = + 1$
charge on $O = - 2$
Let x be oxidation state of P
$2 x + 4 - 2 \times 7 = 0$
$2 x = 10$
$x = + 5$

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