Ijmb Model Questions Vol1 2025 Chemistry Question 9

Practice essay / theory question 9 from the 2025 Ijmb Model Questions Vol1 Chemistry examination. This question covers Redox Reactions, Balancing Redox Equations, Standard Electrode Potentials .

Ijmb Model Questions Vol1 2025 Chemistry Essay / Theory
Topics: Redox Reactions Balancing Redox Equations Standard Electrode Potentials
Question 9 IJMB_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • essay

Potassium permanganate is used to oxidise oxalic acid in an acidic medium. The reaction is carried out in a solution containing sulphuric acid as the source of acidity. The balanced molecular equation, the masses of products formed and the standard cell potential are required.

Question Parts

( a )
Write the oxidation half‑reaction for oxalic acid (C₂O₄²⁻ → CO₂) and the reduction half‑reaction for permanganate ion (MnO₄⁻) in acidic solution, showing the electrons transferred.
( b )
Combine the half‑reactions to obtain the overall balanced molecular equation for the reaction between potassium permanganate and oxalic acid in acidic solution, including the spectator ions (K⁺, H⁺, SO₄²⁻).
( c )
If 0.125 mol of KMnO₄ reacts completely, calculate the mass of carbon dioxide produced. (Molar mass of CO₂ = 44.01 g mol⁻¹)
( d )
Given the standard reduction potentials: MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O E° = +1.51 V and C₂O₄²⁻ → 2CO₂ + 2e⁻ E° = +0.49 V, calculate the standard cell potential (E°cell) for the overall reaction written in part (b). State which half‑reaction occurs at the cathode and which at the anode.

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About This Question

This is Ijmb Model Questions Vol1 2025 Chemistry Question 9. It is one of the essay questions from the 2025 Ijmb Model Questions Vol1 Chemistry examination.

The question covers Redox Reactions, Balancing Redox Equations, Standard Electrode Potentials .

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