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- 1. Multiple ChoiceWhat is electrolysis?breaking down of a compound using a currentmaking a compound using a current
- 2. Multiple ChoiceWhich statement correctly describes the 2 electrodes?The anode is negative and the cathode is positiveThe anode and cathode are both positiveThe anode is positive and the cathode is negativeThe anode and cathode are both negative.
- 3. Multiple ChoiceWhat is the name given to the solution that is being electrolysed?Salt solutionElectric solutionMineral solutionElectrolyte
- 4. Multiple ChoiceIt is essetial that the electrolyte is a liquid so that...Charged ions can migrate towards the electrodes.Charged ions can migrate towards the electrodes.The solution can move around.The current can flow through it.
- 5. Multiple ChoicePositive ions (cations) will move towards the cathode (-) where they will discharge by....Breaking apartLosing electronsClumping together.Gaining electrons
- 6. Multiple ChoiceWhen NaCl solution is electrolysed what has forms at the anode?HydrogenOxygenChlorineSodium
- 7. Multiple ChoiceWhat is the equation to show what happens to Cl ions at the anode.Cl- --> Cl + e-2Cl- --> Cl2 + 2e-Cl2 + 2e- 2Cl-Cl2 + 2e- --> 2Cl-
- 8. Multiple Choice
The diagram shows the electrolysis of lead(II) bromide using inert electrodes. Why does the bulb only light up when the lead(II) bromide is melted?
Bromine atoms in lead(II) bromide are converted to ions when it is melted
Electrons flow through the lead(II) bromide when it is melted
The ions in lead(II) bromide are mobile charge carriers in the molten state.
There are no ions in solid lead(II) bromide
- 9. Multiple Choice
What is the gas produced at the anode during the electrolysis of very dilute hydrochloric acid?
water
oxygen
hydrogen
chlorine
- 10. Multiple ChoiceWhat is the product formed at the anode during the electrolysis of concentrated copper(II) chloride?copperchlorinehydrogenoxygen
- 11. Multiple Choice
Choose the half-equation that shows the discharge of aluminium ion.
Al3+ - 3e- --> Al
Al2+ + 3e- --> Al
Al3+ + 3e- --> Al
Al3+ --> Al + 3e-
- 12. Multiple Choice
What is the half-equation for the discharge of hydroxide ions?
2O2- --> O2 + 4e-
OH- --> OH + e
4OH- --> 2H2O + O2 + 4e-
2H2O + O2 + 4e- --> 4OH-
- 13. Multiple Choice
The picture shows electrolysis of copper(II) sulphate solution using graphite electrodes. Besides formation of brown solid on the cathode, what other observations can be made?
The mass of graphite anode decreases.
The blue colour solution becomes paler.
Bubbles of gas form at the anode.
The blue colour solution becomes darker.
- 14. Multiple ChoiceWhat is the product formed at the cathode during the electrolysis of molten magnesium fluoride?magnesiumhydrogenfluorineoxygen
- 15. Multiple Choice
This question is about a simple cell made up of zinc and copper electrodes and sulfuric acid. The following is true.
Copper ionises and becomes smaller.
Zinc is the positive terminal.
Effervescence will be seen at both electrodes.
- 16. Multiple Choice
What are the products at the electrodes when dilute sulfuric acid is electrolysed using inert electrodes?
A
B
C
D
- 17. Multiple Choice
Electricity is passed separately through concentrated hydrochloric acid, concentrated aqueous
sodium chloride and dilute sulfuric acid.
In which rows are the electrolysis products correctly named?
1, 2 and 3
1 and 2 only
1 and 3 only
2 and 3 only
- 18. Multiple Choice
Which row describes the electrolysis of molten potassium bromide?
A
B
C
D
- 19. Multiple Choice
The diagram shows the electrolysis of concentrated hydrochloric acid and concentrated aqueous
sodium chloride using carbon electrodes.
At which electrode(s) is hydrogen produced?
electrode 1 only
electrodes 1 and 3
electrode 2 only
electrodes 2 and 4
- 20. Multiple Choice
What are the electrode products when molten silver iodide is electrolysed between inert electrodes?
A
B
C
D
- 21. Multiple Choice
Copper and hydrogen can each be formed by electrolysis.
At which electrodes are these elements formed?
A
B
C
D
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