Gce Model Questions Vol1 2025 Chemistry Question 9

Practice essay / theory question 9 from the 2025 Gce Model Questions Vol1 Chemistry examination. This question covers Redox Reactions .

Gce Model Questions Vol1 2025 Chemistry Essay / Theory

Topic: Redox Reactions

Question 9 GCE_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • essay

Manganese(VII) oxide ions (MnO₄⁻) are used to oxidise ferrous ions (Fe²⁺) in an acidic medium. A 25.0 cm³ sample of an aqueous Fe²⁺ solution contains exactly 0.0100 mol of Fe²⁺. The titration is performed with a standard potassium permanganate solution of concentration 0.0200 mol dm⁻³.

Question Parts

( a )

State the oxidation number of manganese in MnO₄⁻ and of iron in Fe²⁺.

( b )

Write the balanced half‑reaction for the reduction of MnO₄⁻ in acidic solution and the balanced half‑reaction for the oxidation of Fe²⁺.

( c )

Combine the half‑reactions to give the overall balanced redox equation for the titration.

( d )

Calculate the volume of the 0.0200 mol dm⁻³ KMnO₄ solution required to titrate the 0.0100 mol of Fe²⁺ completely.

( e )

Explain why the titration must be carried out in an acidic medium.

Detailed Solution & Marking Scheme

Get the step-by-step solution, key points required by examiners and detailed marking guidance through the Edcrib AI Tutor.

Reveal Answer

About This Question

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

The question covers Redox Reactions .

View More Gce Model Questions Vol1 2025 Chemistry Questions More Gce Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows

Chat with Support