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What is the oxidation state of iron in the complex [Fe(CN)6]3-?

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Question: What is the oxidation state of iron in the complex [Fe(CN)6]3-?

Options:

  1. +2
  2. +3
  3. +4
  4. +1

Correct Answer: +3

Solution: 

In the complex [Fe(CN)6]3-, each cyanide (CN) has a charge of -1. Therefore, to balance the overall charge of -3, iron must be in the +3 oxidation state.

What is the oxidation state of iron in the complex [Fe(CN)6]3-?

Practice Questions

Q1
What is the oxidation state of iron in the complex [Fe(CN)6]3-?
  1. +2
  2. +3
  3. +4
  4. +1

Questions & Step-by-Step Solutions

What is the oxidation state of iron in the complex [Fe(CN)6]3-?
  • Step 1: Identify the overall charge of the complex [Fe(CN)6]3-. The charge is -3.
  • Step 2: Determine the charge of each cyanide (CN) ligand. Each CN has a charge of -1.
  • Step 3: Since there are 6 cyanide ligands, calculate the total charge contributed by the cyanides: 6 CN x -1 = -6.
  • Step 4: Set up the equation to find the oxidation state of iron (Fe). Let the oxidation state of Fe be x. The equation is: x + (-6) = -3.
  • Step 5: Solve the equation: x - 6 = -3. Add 6 to both sides: x = -3 + 6.
  • Step 6: Calculate the value: x = +3. Therefore, the oxidation state of iron in the complex is +3.
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