The oxidation number of iron in (Fe( CN)6) -4 is:
Correct answer: B. +2
- A. +3
- B. +2
- C. +4
- D. +6
Explanation
OPTION B is correct as there six ligands in the compound which is a cyano group having a charge of -1. Since there are six ligands so the total negative charge is -6. The Fe atom in the compound is the transition element which accepts electron from the ligand. The Fe atom in the compound has +2 charge. So, the total charge on the compound will be given as -6+2
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About Oxidation and Reduction
Oxidation involves loss of electrons, increase in oxidation number or addition of oxygen, while reduction involves electron gain, decrease in oxidation number or removal of oxygen. The topic covers oxidising and reducing agents, oxidation-number changes, redox equations and the distinction between oxidation at the anode and reduction at the cathode.
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