Variable oxidation states of transition metals – Primrose Kitten

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Variable oxidation states of transition metals

Last updated: 12/02/2020

AQA 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?
- The loss of electrons
- The gain of electrons
- The movement of ions
- The transfer of electrons
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Question 2 of 26

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

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

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

5. Question
Why are redox reactions used for transition metals?
- 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
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Question 6 of 26

6. 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
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Question 7 of 26

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

8. Question
What happens to Fe $^{2+}$ when added to air?
- Oxidises to form Fe $^{3+}$
- Oxidises to form Fe $^+$
- Reduces to form Fe $^{3+}$
- Reduces to form Fe $^+$
Correct

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Question 9 of 26

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

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

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

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

13. Question
Write the equation for the reaction between Fe $^{2+}$ ions and MnO $_4$ $^-$ ions.
- $8H^+(aq) + 5Fe^{2+}(aq) + MnO_4^-(aq) -> 5Fe^{3+}(aq) + Mn^{2+}(aq) + 4H_2O(l)$
- $8H^+(aq) + 5Fe^{2+}(aq) + MnO_4^-(aq) -> 5Fe^{3+}(aq) + Mn^{2+}(aq)$
- $H^+(aq) + 5Fe^{2+}(aq) + MnO_4^-(aq) -> 5Fe^{3+}(aq) + Mn^{2+}(aq) + 4H_2O(l)$
- $H^+(aq) + Fe^{2+}(aq) + MnO_4^-(aq) -> Fe^{3+}(aq) + Mn^{2+}(aq) + H_2O(l)$
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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 $_4$ $^-$ ?
- Purple to colourless/light pink
- Purple to blue
- Blue to purple
- 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?
- It is a self-indicating reaction
- Through a change in mass
- Through gas production
- Using an indicator
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Question 16 of 26

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

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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.
- $14H^+(aq) + 6Fe^{2+}(aq) + C_2O{_7^2-}(aq) -> 6Fe^{3+}(aq) + 2Cr_3^{3+}(aq) + 7H_2O(l)$
- $H^+(aq) + Fe^{3+}(aq) + Cr_2O{_7^{2-}}(aq) -> Fe^{3+}(aq) + Cr_3^{3+}(l) + H_2O(l)$
- $H^+(aq) + 6Fe^{3+}(aq) + Cr_2O{_7^{2-}}(aq) -> Fe^{3+}(aq) + 2Cr_3^{3+}(l) + 7H_2O(l)$
- $14H^+(aq) + 6Fe^{3+}(aq) + Cr_2O{_7^{2-}}(aq) -> 6Fe^{3+}(aq) + 2Cr_3^{3+}(l)$
Correct

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Question 18 of 26

18. Question
Which indicator is used during the titration of potassium dichromate and Fe $^{2+}$ ?
- Diphenylamine sulfonate
- Phenolphthalein
- Methyl orange
- No indicator needed
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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?
- Violet/blue
- Red
- Purple
- Green/blue
Correct

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Question 20 of 26

20. Question
Write the equation for the oxidation of I $^-$ ions.
- $2I^- -> I_2 + 2e^-$
- $I^- -> I_2 + e^-$
- $2I^- -> I^+ + 2e^-$
- $I^- -> I^+ + e^-$
Correct

Incorrect
Question 21 of 26

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

Incorrect
Question 22 of 26

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

Incorrect
Question 23 of 26

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

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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?
- White
- Brown
- Blue
- Green
Correct

Incorrect
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)
- Manganese
- Tin
- Potassium
- Hydrogen
Correct

Incorrect
Question 26 of 26

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

Incorrect

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