Lesson 5.4.3.2
5.4.3.2 Electrolysis of molten ionic compounds Quiz: AQA Combined Science, Unit 11
20 questions
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Lesson 5.4.3.2, Electrolysis of molten ionic compounds: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 11: Chemical changes, written with Revision Ninja.
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The 20 questions
-
When lead bromide is electrolysed in the molten state with inert electrodes, where is lead produced?
- At the anode
- In the electrolyte
- At the cathode
- At both electrodes
-
Where is bromine produced when molten lead bromide is electrolysed?
- At the cathode
- In the solution
- At neither electrode
- At the anode
-
What non-metal is produced from molten lead bromide?
- Lead
- Oxygen
- Bromine
- Hydrogen
-
What is the physical state of the lead produced at the cathode in molten lead bromide?
- Ionic solid
- Solution
- Liquid
- Gas
-
What is produced at the cathode when molten magnesium chloride is electrolysed?
- Magnesium
- Hydrogen
- Chlorine
- Oxygen
-
Which compound, when molten and electrolysed, gives sodium and chlorine?
- Sodium hydroxide
- Lead oxide
- Copper chloride
- Sodium chloride
-
What product forms at the anode when molten sodium chloride is electrolysed?
- Hydrogen
- Oxygen
- Sodium
- Chlorine
-
Which compound is suggested as a safer alternative to lead bromide in practical work?
- Potassium iodide solution
- Anhydrous zinc chloride
- Anhydrous copper sulfate
- Sodium nitrate solution
-
Why are inert electrodes used during the electrolysis of molten lead bromide?
- They are unreactive
- They provide electrons
- They lower melting point
- They conduct heat
-
What happens to lead ions during the electrolysis of molten lead bromide?
- Gain electrons
- Lose electrons
- Lose protons
- Gain protons
-
What happens to bromide ions at the anode during electrolysis?
- Gain electrons
- Lose protons
- Gain neutrons
- Lose electrons
-
Which half equation describes the anode reaction in molten lead bromide?
- 2Br- -> Br2 + 2e-
- Pb2+ + 2e- -> Pb
- Br2 + 2e- -> 2Br-
- Pb -> Pb2+ + 2e-
-
Which half equation describes the cathode reaction in molten lead bromide?
- Br2 + 2e- -> 2Br-
- 2Br- -> Br2 + 2e-
- Pb2+ + 2e- -> Pb
- Pb -> Pb2+ + 2e-
-
What is produced at the cathode when molten calcium chloride is electrolysed?
- Calcium
- Oxygen
- Hydrogen
- Chlorine
-
What is produced at the anode when molten potassium iodide is electrolysed?
- Iodine
- Oxygen
- Hydrogen
- Potassium
-
What is produced at the anode when a binary ionic compound is melted and electrolysed?
- Metal
- Non-metal
- Hydrogen
- Water
-
Why does molten zinc chloride conduct electricity while solid zinc chloride does not?
- Electrons are shared
- Ions are destroyed
- Ions can move
- Atoms become neutral
-
For molten lead bromide, what is the mole ratio of Pb formed to Br2 formed?
- 1 : 2
- 1 : 1
- 2 : 2
- 2 : 1
-
Electrolysis of 0.2 mol of molten lead bromide forms how many moles of bromine?
- 0.05 mol
- 0.2 mol
- 0.1 mol
- 0.4 mol
-
What mass of lead forms from electrolysis of 0.2 mol of molten lead bromide? (Pb = 207)
- 41.4 g
- 8.0 g
- 20.7 g
- 82.8 g
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