Waec Model Questions Vol1 2021 Chemistry Question 33

Practice objective / multiple choice question 33 from the 2021 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Medium Difficulty
Question 33 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective

A galvanic cell is assembled with the half‑cells Zn²⁺/Zn (0.010 M Zn²⁺) and Cu²⁺/Cu (0.10 M Cu²⁺). Standard reduction potentials are E°(Zn²⁺/Zn)= -0.76 V and E°(Cu²⁺/Cu)= +0.34 V. (i) Calculate the cell potential at 25 °C. (ii) If the same cell were used to electrolyse water under the same ion concentrations, what is the minimum voltage that must be applied to drive the overall reaction, neglecting over‑potentials?

Answer Options

Correct Answer A. Cell potential = 1.13 V; minimum voltage for water electrolysis = 1.23 V
B. Cell potential = 1.20 V; minimum voltage for water electrolysis = 1.30 V
C. Cell potential = 1.05 V; minimum voltage for water electrolysis = 1.18 V
D. Cell potential = 0.98 V; minimum voltage for water electrolysis = 1.10 V
Correct Answer
A
Correct Option:
Cell potential = 1.13 V; minimum voltage for water electrolysis = 1.23 V

About This Question

This is Waec Model Questions Vol1 2021 Chemistry Question 33. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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