Redox reactions

Last updated: 03/03/2020

Oxford AQA International A-Level Chemistry Oxidation, reduction and redox reactions Redox reactions

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Question 1 of 22

1. Question
Why are redox reactions used?
- To find the concentration of a transition metal ion
- To find the volume of a transition metal ion
- To find the percentage error of a transition metal ion
- To find the number of moles of a transition metal ion
Question 2 of 22

2. Question
How are redox titrations titrated?
- Oxidising agent titrated against a reducing agent
- Alkali titrated against an oxidising agent
- Acid titrated against an oxidising agent
- Alkali titrated against a reducing agent
Question 3 of 22

3. Question
What is the definition of oxidation?
- The gain of oxygen
- The loss of oxygen
- The loss of hydrogen
- The gain of hydrogen
Question 4 of 22

4. Question
What is the definition of oxidation?
- The loss of electrons
- The gain of electrons
- The movement of ions
- The transfer of electrons
Question 5 of 22

5. Question
What is the definition of reduction?
- The loss of oxygen
- The gain of oxygen
- The loss of hydrogen
- The gain of hydrogen
Question 6 of 22

6. Question
What is the definition of reduction?
- The gain of electrons
- The loss of electrons
- The movement of ions
- The transfer of electrons
Question 7 of 22

7. Question
What happens to electrons in oxidation and reduction reactions?
- They are transferred
- They are destroyed
- They are created
- They are shared
Question 8 of 22

8. Question
Within the following reaction, which element is oxidised?

2NaClO $_3$ (aq) -> 2NaCl(aq) + 3O $_2$ (g)
- Oxygen
- Chlorine
- Sodium
- Sodium chloride
Question 9 of 22

9. Question
Within the following reaction, which element is reduced?

2NaClO $_3$ (aq) -> 2NaCl(aq) + 3O $_2$ (g)
- Chlorine
- Oxygen
- Sodium
- Sodium chloride
Question 10 of 22

10. Question
Within the following reaction, which element is oxidised?

NH $_4$ NO $_3$ (aq) + KOH(aq) -> NH $_4$ OH(aq) + KNO $_3$ (aq)
- Nitrogen
- Potassium
- Oxygen
- Hydrogen
Question 11 of 22

11. Question
Within the following reaction, which element is reduced?

NH $_4$ NO $_3$ (aq) + KOH(aq) -> NH $_4$ OH(aq) + KNO $_3$ (aq)
- Nitrogen
- Potassium
- Oxygen
- Hydrogen
Question 12 of 22

12. Question
What element has been oxidised during the following reaction?

Cl $_2$ (g) + 2NaBr(aq) -> 2NaCl(s) + Br $_2$ (g)
- Bromine
- Sodium
- Chlorine
- Sodium bromide
Question 13 of 22

13. Question
What element has been reduced during the following reaction?

Cl $_2$ (g) + 2NaBr(aq) -> 2NaCl(s) + Br $_2$ (g)
- Chlorine
- Sodium
- Bromine
- Sodium bromide
Question 14 of 22

14. Question
During the following reaction, which element is oxidised?

16HCl(aq) + 5SnCl $_2$ (aq) + 2KMnO $_4$ (aq) -> 2MnCl $_2$ (aq) + 5SnCl $_4$ (aq) + 8H $_2$ O(l) + 2KCl(aq)
- Tin
- Manganese
- Potassium
- Hydrogen
Question 15 of 22

15. Question
During the following reaction, which element is reduced?

16HCl(aq) + 5SnCl $_2$ (aq) + 2KMnO $_4$ (aq) -> 2MnCl $_2$ (aq) + 5SnCl $_4$ (aq) + 8H $_2$ O(l) + 2KCl(aq)
- Manganese
- Tin
- Potassium
- Hydrogen
Question 16 of 22

16. Question
Which element is oxidised and which is reduced during the following reaction?

2H $_2$ O(l) -> 2H $_2$ (g) + O $_2$ (g)
- Oxidised – Oxygen Reduced – Hydrogen
- Oxidised – Hydrogen Reduced – Oxygen
- Oxidised – Water Reduced – Oxygen
- Oxidised – Water Reduced – Hydrogen
Question 17 of 22

17. Question
Which element is oxidised and which is reduced during the following reaction?

Mg(s) + 2HCl(aq) -> MgCl $_2$ (aq) + H $_2$ (g)
- Oxidised – Magnesium Reduced – Hydrogen
- Oxidised – Chlorine Reduced – Magnesium
- Oxidised – Chlorine Reduced – Hydrogen
- Oxidised – Hydrogen Reduced – Magnesium
Question 18 of 22

18. Question
Which element is oxidised and which is reduced during the following reaction?

2Na(s) + 2H $_2$ O(l) -> 2NaOH(aq) + H $_2$ (g)
- Oxidised – Sodium Reduced – Hydrogen
- Oxidised – Oxygen Reduced – Hydrogen
- Oxidised – Sodium Reduced – Oxygen
- Oxidised – Hydrogen Reduced – Oxygen
Question 19 of 22

19. Question
What change in oxidation state does nitrogen undergo during the following reaction?

3Mg(s) + N $_2$ (g) -> Mg $_3$ N $_2$ (aq)
- 0 – -3
- 0 – +3
- +1 – +2
- 0 – -6
Question 20 of 22

20. Question
What change in oxidation state does magnesium undergo during the following reaction?

3Mg(s) + N $_2$ (g) -> Mg $_3$ N $_2$ (aq)
- 0 – +2
- 0 – -3
- +2 – +3
- 0 – -2
Question 21 of 22

21. Question
What change in oxidation state does lithium undergo during following reaction?

2Li(s) + S(aq) -> Li $_2$ S(s)
- 0 – +1
- +1 – 0
- 0 – -1
- +2 – 0
Question 22 of 22

22. Question
What change in oxidation state does sulfur undergo during following reaction?

2Li(s) + S(aq) -> Li $_2$ S(s)
- 0 – -2
- 0 – +2
- +1 – +2
- -2 – 0