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Calculate the oxidation number of the el...

Calculate the oxidation number of the element underline in each of the following cases. A. Al in `Al_(2)O_(3)` b. P in `P_(2)O_(5)`

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The rule used here is that the algebraic sum of the oxidation numbers of all the atoms a molecule is zero.
a. `Al_(2)O_(3)2xx("oxidation number of "Al)+3xx("Oxidation number of O")=0`
`2xx("Oxidation number of Al")+3(-2)=0`
`2xx("oxidation number of Al")+6`
`:.` oxidation number of Al `=+3`
b. `P_(2)O_(5):2xx`(oxidation no. P)`+5(-2)=0`
`:.` oxidationn of `P+(+10)/2=+5`
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