Calculate the oxidation number of the underlined atoms in the following species.
`[ul(Co)(NH_(3))Cl]Cl_(2)`

Explanation

Calculate the oxidation number of the underlined atoms in the following species:
`[ul(Co)(NH_(3))_(5)Cl]Cl_(2)`: Let x represents the oxidation number of the underlined atom. Then,
`[ul(Co)(NH_(3))_(5)Cl] Cl_(2)= x + (0) xx 5 + (-1) + (-1) xx 2= 0`
`x= +3`
The oxidation number of the Co in `[ul(Co)(NH_(3))_(5)Cl] Cl_(2)` is +3.