Question

The oxidation state of Fe in ferrate ion is:

• A. +2
• B. +3
• C. +5
• D. +6

Hint:

In oxyanions, oxygen is usually \(-2\); use charge balance method to find central atom oxidation state.

Answer 1

The Correct Option is D

Step 1: Formula of ferrate ion.
The species is FeO₄²⁻, with each oxygen assigned an oxidation number of –2.

Step 2: Setting up the charge balance.
Let x be the oxidation state of Fe. Total oxygen contribution = 4×(–2) = –8.

Step 3: Equation for net charge.
x – 8 = –2.

Step 4: Solving for x.
x = +6.

Step 5: Conclusion.
Iron in the ferrate ion is in the +6 oxidation state.