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Question

Oxidation number of osmium (Os) in OsO4 is

A
8
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B
6
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C
7
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D
4
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Solution

The correct option is C 8


Image result for oxidation number of osmium (Os) in OsO4 is

It is +8.
See, if there isn’t any charge denoted in the molecule, then we are not gonna consider it ourself.
Also, we know that the most common oxidation state of O is -2, which is the case here also.
If x is the oxidation number of Os, then
x + 4(-2) = 0
gives, x = +8


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