12a Oxidation and Reduction I

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Question 1 of 11

1. Question
1 point(s)
4Al + 3O₂ → 2Al₂O₃

In the reaction above, Aluminium undergoes a/an ________________ reaction.
- oxidation
- reduction
- redox
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Question 2 of 11

2. Question
1 point(s)
2Na + 2H₂O → 2NaOH + H₂

The equation above represents a chemical reaction. Which of the following statement is TRUE about this reaction.
- I. Sodium receives 1 electron to form sodium ion
- II. Water is reduced to become hydrogen gas.
- III. Sodium is an oxidising agent.
- IV. Sodium is oxidised in the reaction
Correct

Incorrect
Question 3 of 11

3. Question
1 point(s)
Which of the followings are oxidising process?
- I. Zinc atoms are ionized to become zinc ions.
- II. Chlorine molecules are ionized to become chlorine ions.
- III. Bromide ions release electrons to form bromine molecules.
- IV. Copper (II) oxide is displaced to form copper metal.
Correct

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Question 4 of 11

4. Question
1 point(s)
Which of the following indicates that a substance undergoes reduction?
- I. The substance obtains oxygen atom from other reactant.
- II. The substance obtains hydrogen from other reactants.
- III. The substance receives electrons from other reactants.
- IV. The oxidation number of the substance increases.
Correct

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Question 5 of 11

5. Question
1 point(s)
Which of the following equation shows that a zinc atom donate 2 electrons to form zinc ion?
- Zn + 2e → Zn²⁺
- Zn → Zn²⁺ + 2e
- Zn²⁺ + 2e → Zn
- Zn²⁺ → Zn + 2e
Correct

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Question 6 of 11

6. Question
1 point(s)
Which of the following is NOT true about oxidation and reduction?
- Oxidation: Gain oxygen
  Reduction: Loss oxygen
- Oxidation: Loss hydrogen
  Reduction: Gain hydrogen
- Oxidation: Gain electron
  Reduction: Loss electron
- Oxidation: Increase of oxidation number
  Reduction: Decrease of oxidation number
Correct

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Question 7 of 11

7. Question
1 point(s)
The oxidation number of a hydrogen ion (H⁺) is
- -2
- -1
- 0
- +1
- +2
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Question 8 of 11

8. Question
1 point(s)
Which of the followings are reducing agent?
- I. Potassium manganate(VII)
- II. Hydrogen peroxide
- III. Hydrogen sulphide
- IV. Sulphur dioxide
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Question 9 of 11

9. Question
1 point(s)
The equation represents the redox reaction between ammonia and copper(II) oxide.

2NH₃ + 3CuO → N₂ + 3Cu + 3H₂O

Which of the following is true about the reaction?
- I. Ammonia is a reducing agent
- II. Nitrogen is a reducing agent
- III. Oxidation number of copper decreases from +2 to 0
- IV. Oxidation number of nitrogen increases from -3 to 0
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Question 10 of 11

10. Question
1 point(s)
Find the oxidation number of sulphur in Na₂S₂O3.
- +2
- +3
- +4
- +6
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Question 11 of 11

11. Question
1 point(s)
Which of the underlined element in the following compounds has the highest oxidation number?
- K₂Cr₂O₇
- Fe₂(SO₄)₃
- PbCl₄
- KMnO₄
Correct

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