Neco 2021 Chemistry Question 18

Practice objective / multiple choice question 18 from the 2021 Neco Chemistry examination.

Neco 2021 Chemistry Objective / Multiple Choice Medium Difficulty
Question 18 NECO • 2021 • CHEMISTRY • objective

In acidic solution the redox reaction between permanganate ion and oxalate ion occurs.\n(a) Balance the overall equation.\n(b) If 0.0250 mol of \( \text{C}_2\text{O}_4^{2-} \) reacts completely with excess \( \text{MnO}_4^- \) in 1.00 L of solution, calculate the concentration of \( \text{Mn}^{2+} \) formed.\n(c) If instead the same amount of oxalate were oxidised by molecular oxygen according to \( \text{C}_2\text{O}_4^{2-} + \text{O}_2 + 2H^+ \rightarrow 2CO_2 + 2H_2O \), determine the volume of \( \text{O}_2 \) gas (at STP) that would be consumed.

Answer Options

Correct Answer A. Balanced: 2MnO4^- + 5C2O4^{2-} + 16H^+ → 2Mn^{2+} + 10CO2 + 8H2O; [Mn^{2+}] = 0.0100 M; O2 volume = 0.560 L
B. Balanced: 2MnO4^- + 5C2O4^{2-} + 16H^+ → 2Mn^{2+} + 12CO2 + 8H2O; [Mn^{2+}] = 0.0100 M; O2 volume = 0.560 L
C. Balanced: 2MnO4^- + 5C2O4^{2-} + 16H^+ → 2Mn^{2+} + 10CO2 + 8H2O; [Mn^{2+}] = 0.0125 M; O2 volume = 0.560 L
D. Balanced: 2MnO4^- + 5C2O4^{2-} + 16H^+ → 2Mn^{2+} + 10CO2 + 8H2O; [Mn^{2+}] = 0.0100 M; O2 volume = 0.700 L
Correct Answer
A
Correct Option:
Balanced: 2MnO4^- + 5C2O4^{2-} + 16H^+ → 2Mn^{2+} + 10CO2 + 8H2O; [Mn^{2+}] = 0.0100 M; O2 volume = 0.560 L

About This Question

This is Neco 2021 Chemistry Question 18. It is one of the objective questions from the 2021 Neco Chemistry examination.

Difficulty level: Medium .

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