Variable oxidation states of transition metals

Last updated: 12/02/2020

OCR-A A-Level Chemistry Transition elements Variable oxidation states of transition metals

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Question 1 of 26

1. Question
What is the definition of oxidation?
- 1. The loss of electrons
- 2. The transfer of electrons
- 3. The gain of electrons
- 4. The movement of ions
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Question 2 of 26

2. Question
What is the definition of oxidation?
- 1. The gain of oxygen
- 2. The loss of oxygen
- 3. The loss of hydrogen
- 4. The gain of hydrogen
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Question 3 of 26

3. Question
What is the definition of reduction?
- 1. The movement of ions
- 2. The transfer of electrons
- 3. The gain of electrons
- 4. The loss of electrons
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Question 4 of 26

4. Question
What is the definition of reduction?
- 1. The loss of oxygen
- 2. The gain of hydrogen
- 3. The gain of oxygen
- 4. The loss of hydrogen
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Question 5 of 26

5. Question
Why are redox reactions used for transition metals?
- 1. To find the number of moles of a transition metal ion
- 2. To find the percentage error of a transition metal ion
- 3. To find the volume of a transition metal ion
- 4. To find the concentration of a transition metal ion
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Question 6 of 26

6. Question
How are redox titrations titrated?
- 1. Acid titrated against an oxidising agent
- 2. Alkali titrated against a reducing agent
- 3. Alkali titrated against an oxidising agent
- 4. Oxidising agent titrated against a reducing agent
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Question 7 of 26

7. Question
Which of the following is an oxidising agent?
- 1. Methane
- 2. Air
- 3. Carbon dioxide
- 4. Hydrochloric acid
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Question 8 of 26

8. Question
What happens to Fe $^{2+}$ when added to air?
- 1. Oxidises to form Fe $^{3+}$
- 2. Reduces to form Fe $^+$
- 3. Reduces to form Fe $^{3+}$
- 4. Oxidises to form Fe $^+$
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Question 9 of 26

9. Question
What oxidation state of iron, Fe $^{2+}$ or Fe $^{3+}$ , is more stable?
- 1. Depends which state they are in
- 2. Fe $^{2+}$
- 3. Fe $^{3+}$
- 4. Both have the same stability
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Question 10 of 26

10. Question
What type of ion is MnO $_4$ $^-$ ?
- 1. Zwitterion
- 2. Charged ion
- 3. Oxidising agent
- 4. Reducing agent
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Question 11 of 26

11. Question
Write the equation for the reduction of MnO $_4$ $^-$ ions.
- 1. $MnO_4^-(aq) + H^+(aq) + 5e^- -> Mn^{2+}(aq) + H_2O(l)$
- 2. $MnO_4^-(aq) + H^+(aq) + e^- -> Mn^{2+}(aq) + H_2O(l)$
- 3. $MnO_4^-(aq) + 8H^+(aq) + 5e^- -> Mn^{2+}(aq) + 4H_2O(l)$
- 4. $MnO_4^-(aq) + 8H^+(aq) + 5e^- -> Mn^+(aq) + 4H_2O(l)$
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Question 12 of 26

12. Question
Write the equation for the oxidation of Fe $^{2+}$ .
- 1. $Fe^{2+}(aq) -> Fe^{3+}(aq)$
- 2. $Fe^{2+}(aq) -> Fe^+(aq)$
- 3. $Fe^{2+}(aq) -> Fe^+(aq) + e^-$
- 4. $Fe^{2+}(aq) -> Fe^{3+}(aq) + e^-$
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Question 13 of 26

13. Question
Write the equation for the reaction between Fe $^{2+}$ ions and MnO $_4$ $^-$ ions.
- 1. $8H^+(aq) + 5Fe^{2+}(aq) + MnO_4^-(aq) -> 5Fe^{3+}(aq) + Mn^{2+}(aq) + 4H_2O(l)$
- 2. $8H^+(aq) + 5Fe^{2+}(aq) + MnO_4^-(aq) -> 5Fe^{3+}(aq) + Mn^{2+}(aq)$
- 3. $H^+(aq) + 5Fe^{2+}(aq) + MnO_4^-(aq) -> 5Fe^{3+}(aq) + Mn^{2+}(aq) + 4H_2O(l)$
- 4. $H^+(aq) + Fe^{2+}(aq) + MnO_4^-(aq) -> Fe^{3+}(aq) + Mn^{2+}(aq) + H_2O(l)$
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Question 14 of 26

14. Question
What colour change occurs at the end point of the reaction between Fe $^{2+}$ with MnO $_4$ $^-$ ?
- 1. Purple to blue
- 2. Blue to purple
- 3. Purple to colourless/light pink
- 4. Colourless to pink/purple
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Question 15 of 26

15. Question
How is the end point found for the reaction between Fe $^{2+}$ ions with MnO $_4$ $^-$ ions?
- 1. Using an indicator
- 2. Through gas production
- 3. Through a change in mass
- 4. It is a self-indicating reaction
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Question 16 of 26

16. Question
Write the equation for the reduction of Cr $_2$ O $_7$ $^{2-}$ ions.
- 1. $Cr_2O_7^{2-}(aq) + 14H^+(aq) + 6e^- -> 2Cr_3^{3+}(aq) + 7H_2O(l)$
- 2. $Cr_2O_7^{2-}(aq) + H^+(aq) + 6e^- -> 2Cr_3^{3+}(aq) + H_2O(l)$
- 3. $Cr_2O_7^{2-}(aq) + 14H^+(aq) + 6e^- -> Cr_3^{3+}(aq) + H_2O(l)$
- 4. $Cr_2O_7^{2-}(aq) + H^+(aq) + 6e^- -> Cr_3^{3+}(aq) + H_2O(l)$
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Question 17 of 26

17. Question
Write the equation for the reaction between Fe $^{2+}$ ions with Cr $_2$ O $_7$ $^{2-}$ ions.
- 1. $H^+(aq) + 6Fe^{3+}(aq) + Cr_2O{_7^{2-}}(aq) -> Fe^{3+}(aq) + 2Cr_3^{3+}(l) + 7H_2O(l)$
- 2. $14H^+(aq) + 6Fe^{3+}(aq) + Cr_2O{_7^{2-}}(aq) -> 6Fe^{3+}(aq) + 2Cr_3^{3+}(l)$
- 3. $H^+(aq) + Fe^{3+}(aq) + Cr_2O{_7^{2-}}(aq) -> Fe^{3+}(aq) + Cr_3^{3+}(l) + H_2O(l)$
- 4. $14H^+(aq) + 6Fe^{2+}(aq) + C_2O{_7^2-}(aq) -> 6Fe^{3+}(aq) + 2Cr_3^{3+}(aq) + 7H_2O(l)$
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Question 18 of 26

18. Question
Which indicator is used during the titration of potassium dichromate and Fe $^{2+}$ ?
- 1. No indicator needed
- 2. Phenolphthalein
- 3. Diphenylamine sulfonate
- 4. Methyl orange
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Question 19 of 26

19. Question
What colour is the end point within the titration of potassium dichromate and Fe $^{2+}$ ions?
- 1. Red
- 2. Green/blue
- 3. Violet/blue
- 4. Purple
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Question 20 of 26

20. Question
Write the equation for the oxidation of I $^-$ ions.
- 1. $2I^- -> I_2 + 2e^-$
- 2. $I^- -> I_2 + e^-$
- 3. $2I^- -> I^+ + 2e^-$
- 4. $I^- -> I^+ + e^-$
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Question 21 of 26

21. Question
Write the equation for the reduction of Cu $^{2+}$ ions.
- 1. $Cu^{2+} + 2e^- -> Cu^+$
- 2. $Cu^{2+} + e^- -> Cu^+$
- 3. $Cu^{2+} + e^- -> Cu^{3+}$
- 4. $Cu^{2+} + 2e^- -> Cu^{3+}$
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Question 22 of 26

22. Question
Write the equation for the reaction between I $^-$ ions and Cu $^{2+}$ ions.
- 1. $2Cu^{2+}(aq) + 4I^-(aq) -> 2CuI(s) + I_2(aq)$
- 2. $2Cu^{2+}(aq) + 4I^-(aq) -> 2CuI(s)$
- 3. $2Cu^+(aq) + 2I^-(aq) -> 2CuI(s) + I_2(aq)$
- 4. $Cu^{2+}(aq) + I^-(aq) -> CuI(s) + I_2(aq)$
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Question 23 of 26

23. Question
What colour is the end point during the titration of I $^-$ ions and Cu $^{2+}$ ions?
- 1. Pale green
- 2. Blue/black
- 3. Yellow/orange
- 4. Brown
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Question 24 of 26

24. Question
What colour precipitate is formed during the reaction between I $^-$ ions and Cu $^{2+}$ ions?
- 1. White
- 2. Green
- 3. Brown
- 4. Blue
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Question 25 of 26

25. Question
Within 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)
- 1. Manganese
- 2. Tin
- 3. Hydrogen
- 4. Potassium
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Question 26 of 26

26. Question
Within the following reaction, which element is oxidised? $16HCl(aq) + 5SnCl_2(aq) + 2KMnO_4(aq) -> 2MnCl_2(aq) + 5SnCl_4(aq) + 8H_2O(l) + 2KCl(aq)$
- 1. Tin
- 2. Manganese
- 3. Potassium
- 4. Hydrogen
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