Gce Model Questions Vol1 2021 Chemistry Question 17

Practice objective / multiple choice question 17 from the 2021 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Medium Difficulty
Question 17 GCE_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective

A 25.0 mL sample of an aqueous iron solution contains both Fe^{2+} and Fe^{3+} ions. The total amount of iron (Fe^{2+}+Fe^{3+}) is 0.0100 mol. The solution is acidified and titrated with 0.0200 M KMnO_{4} in acidic medium. The titration reaches the endpoint after 31.2 mL of KMnO_{4} solution has been added. (a) Write the net ionic equation for the reaction between MnO_{4}^{-} and Fe^{2+} in acidic solution. (b) Calculate the concentration of Fe^{2+} in the original sample. (c) Determine the concentration of Fe^{3+} in the original sample.

Answer Options

A. Fe^{2+} concentration = 0.125\,\text{M}; Fe^{3+} concentration = 0.225\,\text{M}
B. Fe^{2+} concentration = 0.150\,\text{M}; Fe^{3+} concentration = 0.250\,\text{M}
Correct Answer C. Fe^{2+} concentration = 0.125\,\text{M}; Fe^{3+} concentration = 0.275\,\text{M}
D. Fe^{2+} concentration = 0.100\,\text{M}; Fe^{3+} concentration = 0.300\,\text{M}
Correct Answer
C
Correct Option:
Fe^{2+} concentration = 0.125\,\text{M}; Fe^{3+} concentration = 0.275\,\text{M}

About This Question

This is Gce Model Questions Vol1 2021 Chemistry Question 17. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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