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- 1. Multiple Choice
Choose all the statements which contain correct definitions of reduction
the removal of oxygen
the removal of hydrogen
the removal of electrons
the decrease in oxidation state
- 2. Multiple Choice
Which one of the following conversions is an example of reduction?
Copper (II) oxide to copper (II) sulfate
Copper (II) oxide to copper
Hydrochloric acid to chlorine
Lead (II) nitrate to lead (II) chloride
- 3. Multiple Choice
The ionic equation shows the reaction between zinc (Zn) and hydrochloric acid.
Zn + 2H+ -> Zn2+ + H2
What change takes place in the zinc?
It gains electrons
Its oxidation state increases
It is reduced
It gains hydrogen
- 4. Multiple Choice
When a gas changes iron (III) oxide to iron (II) oxide, it shows that the gas is
a reducing agent
an oxidizing agent
a combustible gas
a diffusible gas
- 5. Multiple Choice
Choose all the statements which are correct for an oxidising agent.
removes hydrogen
gains oxygen
is reduced at the end of the reaction
accepts electrons
- 6. Multiple Choice
In the reaction, Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)
carbon monoxide is reduced
carbon monoxide is the oxidising agent
iron(III) oxide is oxidised
iron(III) oxide is the oxidising agent
- 7. Multiple Choice
Name the oxidising agent in the following reaction:
nitrogen + hydrogen -> ammonia
nitrogen
hydrogen
ammonia
- 8. Multiple Choice
A
B
C
D
- 9. Multiple Choice
State the reducing agent in this reaction.
Cu + 4HNO3 -> Cu(NO3)2 + 2H2O + 2NO2
Cu
HNO3
Cu(NO3)2
NO2
- 10. Multiple Choice
Check all the equations whereby the underlined substances has been oxidized.
carbon dioxide + carbon -> carbon monoxide
iron (II) oxide + aluminium -> aluminium oxide + iron
copper (II) oxide + ammonia -> copper + nitrogen + water
hydrogen + oxygen -> water
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