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- 1. Multiple-choice2 minutes1 pt
The equations for two reactions of iodide ions are shown.
Which statement is correct?
Both reactions are redox reactions.
Neither reaction is a redox reaction.
Only reaction 1 is a redox reaction.
Only reaction 2 is a redox reaction.
- 2. Multiple-choice3 minutes1 pt
When aqueous iron(III) chloride is added to aqueous potassium iodide a chemical reaction
occurs and iodine is formed.
Which statement is correct?
Iodide ions are oxidised, they gain electrons in this reaction.
Iodide ions are oxidised, they lose electrons in this reaction.
Iron(III) chloride is oxidised in this reaction.
Neither iodide ions nor iron(III) chloride is oxidised in this reaction.
- 3. Multiple-choice3 minutes1 pt
The equation for the reaction between zinc and aqueous copper(II) sulfate is shown.
Zn + CuSO4 → ZnSO4 + Cu
Which statement is correct?
The oxidation state of the oxidising agent has changed from 0 to +2.
The oxidation state of the reducing agent has changed from 0 to +2.
The oxidation state of the reducing agent has changed from +2 to 0.
This is not a redox reaction. The solution changes from colourless to blue.
- 4. Multiple-choice3 minutes1 pt
Chlorine displaces bromine from aqueous potassium bromide.
The ionic equation for the reaction is shown.
Cl2 + 2Br– → 2Cl– + Br2
Which statement about this reaction is correct?
Bromide ions act as an oxidising agent.
Bromide ions are oxidised when electrons are lost.
Chlorine acts as a reducing agent.
Chlorine is reduced when electrons are lost.
- 5. Multiple-choice1 minute1 pt
In the blast furnace, iron is formed when iron(III) oxide reacts with carbon monoxide in a redox
reaction.
Fe2O3 + 3CO → 2Fe + 3CO2
Which substance is the oxidising agent and which substance is the reducing agent?
A
B
C
D
- 6. Multiple-choice3 minutes1 pt
The equation for the reaction between iron(II) sulfate and bromine is shown.
6FeSO4 + 3Br2 → 2Fe2(SO4)3 + 2FeBr3
Which row identifies the oxidising agent and the reducing agent?
A
B
C
D
- 7. Multiple-choice1 minute1 pt
The reaction between magnesium and carbon dioxide is shown in the equation.
2Mg + CO2 → 2MgO + C
Which statement describes what happens in this reaction?
Carbon is oxidised.
Magnesium is reduced.
Neither oxidation nor reduction happens.
The carbon in carbon dioxide is reduced
- 8. Multiple-choice2 minutes1 pt
Which changes represent reduction?
1 and 2
1 and 3
1 only
2 only
- 9. Multiple-choice2 minutes1 pt
Which changes represent oxidation?
1 and 2
1 and 3
1 only
2 only
- 10. Multiple-choice3 minutes1 pt
The thermite reaction can be used to produce iron from iron(III) oxide.
The equation for the reaction is shown.
2Al + Fe2O3 → 2Fe + Al2O3
Which statements about this reaction are correct?
1 and 3
1 and 4
2 and 3
3 and 4
- 11. Multiple-choice2 minutes1 pt
The ionic equation for the reaction between zinc and aqueous copper ions is shown.
Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
Which statement about this reaction is correct?
Copper ions are oxidised and their oxidation state changes.
Copper ions are reduced because they lose electrons.
Zinc atoms are oxidised and their oxidation state changes.
Zinc atoms are reduced because they gain electrons.
- 12. Multiple-choice2 minutes1 pt
The equation for a redox reaction is shown.
2Fe3+ + Zn → 2Fe2+ + Zn2+
Which statements are correct?
all
1 and 2
1 and 3
2 and 3
- 13. Multiple-choice3 minutes1 pt
Iron(II) chloride solution reacts with chlorine gas.
The equation is shown.
2FeCl2(aq) + Cl2(g) → 2FeCl3(aq)
Which statements about this reaction are correct?
1 and 2
2 and 3
3 and 4
2 and 4
- 14. Multiple-choice3 minutes1 pt
Silver chloride reacts when it is exposed to light.
Which row shows what happens to the silver in this process?
A
B
C
D
- 15. Multiple-choice1 minute1 pt
Copper(II) oxide reacts with hydrogen.
CuO + H2 → Cu + H2O
Which row is correct?
A
B
C
D
