Waec Model Questions Vol1 2021 Chemistry Question 21
Practice objective / multiple choice question 21 from the 2021 Waec Model Questions Vol1 Chemistry examination.
A 200.0 mL solution contains Fe²⁺ and Cr²⁺ ions. It is titrated with 0.0200 M KMnO₄ in acidic medium. Exactly 25.0 mL of the KMnO₄ solution is added, which first oxidises all Fe²⁺ and then partially oxidises Cr²⁺. The excess KMnO₄ remaining after the reaction is back‑titrated with 0.0100 M Fe²⁺ solution, requiring 10.0 mL. If the original concentration of Cr²⁺ was 0.0050 M, calculate the original concentration of Fe²⁺ in the mixture.
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About This Question
This is Waec Model Questions Vol1 2021 Chemistry Question 21. It is a objective / multiple choice question from the 2021 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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