Neco 2019 Chemistry Question 21

Practice objective / multiple choice question 21 from the 2019 Neco Chemistry examination.

Neco 2019 Chemistry Objective / Multiple Choice Medium Difficulty
Question 21 NECO • 2019 • CHEMISTRY • objective

An electrochemical cell is constructed as follows: Zn(s) | Zn^{2+} (0.010 M) || Cu^{2+} (unknown) | Cu(s). At 25°C the measured emf of the cell is 1.05 V. Standard reduction potentials are \(E^{\circ}_{\text{Cu}^{2+}/\text{Cu}} = +0.34\,\text{V}\) and \(E^{\circ}_{\text{Zn}^{2+}/\text{Zn}} = -0.76\,\text{V}\). \(a\) Calculate the concentration of Cu^{2+} in the cell. \(b\) Using the standard cell potential, determine the equilibrium constant \(K\) for the overall cell reaction.

Answer Options

A. [Cu^{2+}] = 1.0\\times10^{-4}\\ \text{M};\\ K \\approx 3.0\\times10^{37}
B. [Cu^{2+}] = 5.0\\times10^{-4}\\ \text{M};\\ K \\approx 1.5\\times10^{36}
Correct Answer C. [Cu^{2+}] = 2.0\times10^{-4}\ \text{M};\ K \approx 1.5\times10^{37}
D. [Cu^{2+}] = 2.0\\times10^{-3}\\ \text{M};\\ K \\approx 1.5\\times10^{35}
Correct Answer
C
Correct Option:
[Cu^{2+}] = 2.0\times10^{-4}\ \text{M};\ K \approx 1.5\times10^{37}

About This Question

This is Neco 2019 Chemistry Question 21. It is one of the objective questions from the 2019 Neco Chemistry examination.

Difficulty level: Medium .

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