Neco 2018 Chemistry Question 50

Practice objective / multiple choice question 50 from the 2018 Neco Chemistry examination.

Neco 2018 Chemistry Objective / Multiple Choice Hard Difficulty
Question 50 NECO • 2018 • CHEMISTRY • objective

A 25.00 mL sample of an aqueous solution containing both \(\mathrm{Fe^{2+}}\) and \(\mathrm{Fe^{3+}}\) is treated with excess potassium permanganate in acidic medium. The permanganate solution used is 0.0500 M, and 15.00 mL of it is added. The excess permanganate is then back‑titrated with 0.0200 M oxalic acid, requiring 10.00 mL of the acid. The total iron concentration (\(\mathrm{Fe^{2+}}+\mathrm{Fe^{3+}}\)) in the original sample is known to be 0.200 M. Determine the concentrations of \(\mathrm{Fe^{2+}}\) and \(\mathrm{Fe^{3+}}\) in the original sample.

Answer Options

Correct Answer A. [Fe^{2+}] = 0.134 M; [Fe^{3+}] = 0.066 M
B. [Fe^{2+}] = 0.100 M; [Fe^{3+}] = 0.100 M
C. [Fe^{2+}] = 0.150 M; [Fe^{3+}] = 0.050 M
D. [Fe^{2+}] = 0.120 M; [Fe^{3+}] = 0.080 M
Correct Answer
A
Correct Option:
[Fe^{2+}] = 0.134 M; [Fe^{3+}] = 0.066 M

About This Question

This is Neco 2018 Chemistry Question 50. It is one of the objective questions from the 2018 Neco Chemistry examination.

Difficulty level: Hard .

View More Neco 2018 Chemistry Questions More Neco Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support