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Calculate the oxidation number of the un...

Calculate the oxidation number of the underlined atoms in the following species.
`ul(N)H_(2)OH,[ul(Co)(NH_(3))_(5)Cl]Cl_(2),(ul(N_(2))H_(5))_(2)SO_(4),ul(Mg)_(3)N_(2)`

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Calculate the oxidation number of the underlined atoms in the following species:
`ul(N)H_(2)OH`: Let x represents the oxidation number of the underlined atom. Then,
`ul(N)H_(2)OH = x + (+1) xx 2 + (-2) + (+1)= 0`
`x= -1`
The oxidation number of the N in `ul(N)H_(2)OH` is `-1`.
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