STANDARD Chemistry Balancing Redox Reactions MCQ Question
Which of the following is correct representation of a given molecular equation in ionic form? K₂Cr₂O₇ + 7H₂SO₄ + 6FeSO₄ → 3Fe₂(SO₄)₃ + Cr₂(SO₄)₃ + K₂SO₄ + 7H₂O
Cr₂O₇²⁻ + 14H⁺ + 6Fe²⁺ → 6Fe³⁺ + 2Cr³⁺ + 7H₂O
2K⁺ + Cr₂O₇²⁻ + 7SO₄²⁻ + 6Fe²⁺ → 3Fe³⁺ + SO₄²⁻ + Cr³⁺ + K⁺ + 7H₂O
Cr₂O₇²⁻ + 2K⁺ + 7H⁺ + 6Fe²⁺ → 6Fe³⁺ + 6Cr³⁺ + K⁺
Cr₂O₇²⁻ + 7H⁺ + 6Fe²⁺ → 3Fe²⁺ + 3Cr³⁺ + 2K⁺ + 7H₂O
Correct Answer
Detailed Explanation
The correct ionic equation is derived by eliminating the common species from the molecular equation. The balanced ionic equation is Cr₂O₇²⁻ + 14H⁺ + 6Fe²⁺ → 6Fe³⁺ + 2Cr³⁺ + 7H₂O.
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