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Chapter 1 - Transition Elements and Iron Metallurgy

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Lesson 3: Electrolysis, Faraday’s Laws and Industrial Applications — Picture questions (exam style)

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1.
Three electrolytic cells in series contain Zn2+, Cu2+ and Ni2+; 1 A flows for 3860 s. Which option is correct? (F = 96 500 C)
Three electrolytic cells in series contain Zn²⁺, Cu²⁺ and Ni²⁺; 1 A flows for 3860 s. Which option is correct? (F = 96 500 C)
m(Zn) = 2.6 g, m(Cu) : m(Ni) = 1
m(Zn) = 2.6 g, m(Cu) : m(Ni) = 1.08
m(Zn) = 2.6 g, m(Cu) : m(Ni) = 0.929
m(Zn) = 1.3 g, m(Cu) : m(Ni) = 1.08
2.
A solution containing Cu2+, Ag+, Zn2+ at equal concentrations is electrolysed with inert electrodes. Which ion is reduced first at the cathode? (use the table)
A solution containing Cu²⁺, Ag⁺, Zn²⁺ at equal concentrations is electrolysed with inert electrodes. Which ion is reduced first at the cathode? (use the table)
Ag+
Zn2+
all deposit together
Cu2+
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