Indicate the oxidation state of the central metal ion in each of the following complex
(a) `[Cu(NH_(3))_(4)]^(2+)`
(b) `[Cu(Br_(4))]^(2-)`
(c ) `[Cu(CN)_(2)]^(Θ)`
(d) `[Cu(NH_(3))_(4)CO_(3)]^(o+)`
(e) `[PtCI_(4)]^(2-)`
(f) `[Co(NH_(3))_(2)(NO_(2))_(4)]^(Θ)`
(g) `Fe(CO)_(5))`
(h) `[ZnCI_(4)]^(2-)`
(i) `[Fe(en)_(3)]^(2+)` .

Explanation

To determine the oxidation state of the central metal ion in each of the given coordination complexes, we will follow a systematic approach. We will denote the oxidation state of the central metal ion as \(X\) and consider the charges contributed by the ligands.

### Step-by-Step Solution:

**(a)** For the complex \([Cu(NH_3)_4]^{2+}\):
- Let \(X\) be the oxidation state of Cu.
- \(NH_3\) is a neutral ligand, contributing 0 charge.
- The total charge of the complex is \(+2\).
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