Neco 2018 Chemistry Question 31

Practice objective / multiple choice question 31 from the 2018 Neco Chemistry examination.

Neco 2018 Chemistry Objective / Multiple Choice Medium Difficulty
Question 31 NECO • 2018 • CHEMISTRY • objective

A galvanic cell is constructed as follows: Zn(s) | Zn^{2+} (unknown concentration) || Cu^{2+} (0.10 M) | Cu(s). The standard reduction potentials are E\degree(Zn^{2+}/Zn) = -0.76 V and E\degree(Cu^{2+}/Cu) = +0.34 V. At 25\degreeC the measured cell EMF is 1.05 V. (a) Calculate the concentration of Zn^{2+} in the cell. (b) If 0.500 C of charge passes through the cell, how many milligrams of Zn are deposited on the Zn electrode?

Answer Options

Correct Answer A. Zn^{2+} concentration = 4.9 M; mass of Zn deposited = 0.169 mg
B. Zn^{2+} concentration = 3.1 M; mass of Zn deposited = 0.120 mg
C. Zn^{2+} concentration = 4.0 M; mass of Zn deposited = 0.150 mg
D. Zn^{2+} concentration = 5.5 M; mass of Zn deposited = 0.200 mg
Correct Answer
A
Correct Option:
Zn^{2+} concentration = 4.9 M; mass of Zn deposited = 0.169 mg

About This Question

This is Neco 2018 Chemistry Question 31. It is one of the objective questions from the 2018 Neco Chemistry examination.

Difficulty level: Medium .

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