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Electrolysis Exam Questions
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Electrolysis Exam Questions
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25 Questions

1. State one use of chlorine gas.

2. Solution X is alkaline. Which ion makes solution X alkaline?

3. Sodium chloride is electrolysed. The ionic half equations are: - - Negative electrode: 2(H2O) + 2e- ---> 2(OH-) +H2 - - Positive electrode: 2(Cl-) --> CL2 + 2e- - - State how these ionic half equations show that equal volumes of the two gases should be collected.

4. Aluminum is extracted from its ore using electrolysis. Why is it not extracted using carbon monoxide?

5. Name the method used in the diagram to collect the sulfur dioxide gas. [1 Mark]

6. Some hydrogen chloride was bubbled into water. This made a solution with a pH of 1. Which ion gave the solution a pH of 1?

7. Sulfur dioxide gas is formed during the reaction between dilute hydrochloric acid and sodium sulfite, Na2SO3 A salt and water are also formed.Write a chemical equation for this reaction.

8. Explain why chlorine gas forms at the positive electrode.

9. Suggest the purpose of the silica gel. [1 mark]

10. state the final colour of the solution formed from the displacement reaction between sodium bromide and chlorine.

11. Explain whether or not a reaction takes place when bromine water is added to sodium chloride solution.

12. An electric current was passed through dilute sulphuric acid. Oxygen was formed at the anode. What name is given to solutions which decompose when electricity is passed through them?

13. A few drops of methyl orange indicator are added to this acidic solution. State the colour of the indicator in this solution.

14. Write the equation for the displacement reaction between sodium bromide and chlorine.

15. The electrolysis of sodium chloride solution is an industrial process. Why do chloride ions move to the positive electrode?

16. A student investigates the rate of the reaction between magnesium ribbon and dilute hydrochloric acid. The products are magnesium chloride and hydrogen. - - The equation for the reaction is - - Mg(.............) + 2HCl(.............) → MgCl2(.............) + H2(.............) - - Complete the equation by adding the state symbols.

17. Why is iron not extracted using electrolysis?

18. Suggest why the volume of chlorine collected is less than expected.

19. Name the type of bond between the hydrogen and the chlorine atoms in a molecule of hydrogen chloride.

20. What colour does universal indicator go in contact with a tub of water after its reaction with potassium? why?

21. The electrolysis of sodium chloride solution, in the laboratory. Which gas forms at the negative electrode?

22. Sodium chloride solution contains two types of positive ions, sodium ions (Na+) and hydrogen ions (H+). Why is hydrogen produced at the negative electrode and not sodium?

23. State the physical property of sulfur dioxide gas that allows it to be collected in this way.

24. Give the formula of the ion responsible for this colour.

25. An alkali is then added to neutralise the acid. State the final colour of the indicator.

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