Neco Model Questions Vol1 2019 Chemistry Question 47

Practice objective / multiple choice question 47 from the 2019 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2019 Chemistry Objective / Multiple Choice Medium Difficulty
Question 47 NECO_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • objective

A 25.0 mL sample of 0.100 M \(\mathrm{Fe^{2+}}\) solution is titrated with 0.0500 M \(\mathrm{KMnO_4}\) in acidic medium. The balanced redox reaction is \(\mathrm{5 Fe^{2+} + MnO_4^- + 8 H^+ \rightarrow 5 Fe^{3+} + Mn^{2+} + 4 H_2O}\). If 12.0 mL of the \(\mathrm{KMnO_4}\) solution is required to reach the endpoint, calculate (a) the moles of \(\mathrm{Fe^{2+}}\) initially present, (b) the moles of \(\mathrm{KMnO_4}\) actually reacted, and (c) the percentage excess of \(\mathrm{KMnO_4}\) used beyond the stoichiometric requirement.

Answer Options

Correct Answer A. a) 0.00250 mol; b) 0.000600 mol; c) 20 %
B. a) 0.00200 mol; b) 0.000550 mol; c) 10 %
C. a) 0.00300 mol; b) 0.000650 mol; c) 30 %
D. a) 0.00250 mol; b) 0.000500 mol; c) 0 %
Correct Answer
A
Correct Option:
a) 0.00250 mol; b) 0.000600 mol; c) 20 %

About This Question

This is Neco Model Questions Vol1 2019 Chemistry Question 47. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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