Waec Model Questions Vol1 2018 Chemistry Question 50

Practice objective / multiple choice question 50 from the 2018 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2018 Chemistry Objective / Multiple Choice Hard Difficulty
Question 50 WAEC_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • objective

A galvanic cell is set up with a Zn electrode in 0.10 M ZnSO₄ and a Cu electrode in an unknown Cu²⁺ solution. At 25 °C the cell EMF is 0.76 V. Standard reduction potentials are E°(Zn²⁺/Zn) = -0.76 V and E°(Cu²⁺/Cu) = +0.34 V. (a) Calculate the concentration of Cu²⁺ in the solution. (b) If a current of 0.50 A is passed for 2.00 h, how many grams of copper will be deposited on the Cu electrode?

Answer Options

A. Cu²⁺ concentration = 1.2×10⁻⁴ M; mass of Cu deposited = 0.85 g
Correct Answer B. Cu²⁺ concentration = 3.3×10⁻¹³ M; mass of Cu deposited = 1.19 g
C. Cu²⁺ concentration = 9.8×10⁻⁸ M; mass of Cu deposited = 0.60 g
D. Cu²⁺ concentration = 5.6×10⁻¹² M; mass of Cu deposited = 2.38 g
Correct Answer
B
Correct Option:
Cu²⁺ concentration = 3.3×10⁻¹³ M; mass of Cu deposited = 1.19 g

About This Question

This is Waec Model Questions Vol1 2018 Chemistry Question 50. It is one of the objective questions from the 2018 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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