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In the complexes, and , the respective oxidation numbers of central metal atoms are:
In the complexes, $[\text{Fe}(\text{CN})_6]^{3-}$ and $[\text{Pt}(\text{en})(\text{H}_2\text{O})_2\text{Br}(\text{NO}_2)]^{2+}$, the respective oxidation numbers of central metal atoms are:
- (a)+3 and +4
- (b)+2 and +2
- (c)+2 and +4
- (d)+3 and +2
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From ISC 2026 Improvement Chemistry Paper 1, question 1(B)(i).