The oxidation number of \(Co\) in complex \([Co(NH_2-CH_2-CH_2-NH_2)_3]_2(SO_4)_3\)

3

The correct answer is option 1. 3.

The given compound is \([Co(NH_2-CH_2-CH_2-NH_2)_3]_2(SO_4)_3\)

Let the oxidation number of \(Co\) in the given complex be \(x\)

The charge of \(NH_2-CH_2-CH_2-NH_2)\) ligand is \(0\)

The charge of \(SO_4\) is \(-2\)

\(∴ 2 × (x + 2 × 0) + 3(-2) = 0\)

or, \(2x + 0 - 6 = 0\)

or, \(2x = 6\)

or, \(x = 3\)

Thus, the oxidation number of \(Co\) is +3.