Igcse Model Questions Vol1 2019 Chemistry Question 9

Practice essay / theory question 9 from the 2019 Igcse Model Questions Vol1 Chemistry examination. This question covers Redox reactions, Balancing redox equations, Stoichiometry of gases, Redox titration .

Igcse Model Questions Vol1 2019 Chemistry Essay / Theory
Topics: Redox reactions Balancing redox equations Stoichiometry of gases Redox titration
Question 9 IGCSE_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • essay

A sample of an aqueous solution contains potassium permanganate (KMnO₄) and oxalic acid (H₂C₂O₄). The solution is acidified with dilute sulphuric acid and heated, causing the permanganate ion to be reduced to Mn²⁺ while oxalic acid is oxidised to carbon dioxide.

Question Parts

( a )
Write the balanced overall redox equation for the reaction in acidic medium.
( b )
Using the half‑reaction method, show the steps required to balance the equation, including the identification of oxidation numbers for Mn and C in the reactants and products.
( c )
If 0.10 mol of KMnO₄ reacts completely with excess oxalic acid, calculate the volume of CO₂ gas produced at STP (22.4 L mol⁻¹).
( d )
The reaction mixture is later titrated with a standard solution of sodium thiosulphate (Na₂S₂O₃) to determine the amount of unreacted permanganate. Explain how the titration would be carried out, including the chemical equation for the titration reaction and the indicator used.

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About This Question

This is Igcse Model Questions Vol1 2019 Chemistry Question 9. It is one of the essay questions from the 2019 Igcse Model Questions Vol1 Chemistry examination.

The question covers Redox reactions, Balancing redox equations, Stoichiometry of gases, Redox titration .

View More Igcse Model Questions Vol1 2019 Chemistry Questions More Igcse Model Questions Vol1 Practice Questions Back to Questions

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