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

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  • Questions count: 6
  • Passing grade: 60%
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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+
3.
Two electrolytic cells in series (diagram) contain Ni2+ and Zn2+. 2.16 g of Ni is deposited in the first. What mass of Zn is deposited in the second?
Two electrolytic cells in series (diagram) contain Ni²⁺ and Zn²⁺. 2.16 g of Ni is deposited in the first. What mass of Zn is deposited in the second?
4.14 g
1.96 g
2.38 g
2.16 g
4.
A surface of 100 cm2 is to be plated with Cu 5.00 μm thick (density 8.96 g cm−3) using 5 A. How long is needed?
A surface of 100 cm² is to be plated with Cu 5.00 μm thick (density 8.96 g cm⁻³) using 5 A. How long is needed?
2.27 min
9.08 min
4.54 min
272 min
5.
When acidified water is electrolysed with 10 A for 96.5 min, what volume of H₂ (STP) is evolved?
When acidified water is electrolysed with 10 A for 96.5 min, what volume of H₂ (STP) is evolved?
13.4 L
3.36 L
6.72 L
403 L
6.
A surface of 200 cm2 is to be plated with Ag 20.0 μm thick (density 10.5 g cm−3) using 5 A. How long is needed?
A surface of 200 cm² is to be plated with Ag 20.0 μm thick (density 10.5 g cm⁻³) using 5 A. How long is needed?
25.0 min
751 min
21.8 min
12.5 min
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