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Oxidation, reduction and half-equations

12th grade (Year 13 in England) · 16 questions · Common Core: NGSS.HS-PS1-2 · England: GCSE Chemistry: Chemical changes (oxidation and reduction in terms of electrons, Higher)

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1
Question 1
Redox: which statement is NOT true?
- A. Oxidation and reduction always happen together.
- B. In a displacement reaction, the more reactive metal is oxidised.
- C. Reduction always means gaining oxygen.
- D. Oxidation is the loss of electrons.
2
Question 2
Iron is added to a solution containing copper ions and displaces the copper. Which species is reduced?
- A. iron atoms
- B. copper ions
Question 3
Complete the half-equation at the cathode: Al³⁺ + ? e⁻ → Al. How many electrons are needed?
Answer
4
Question 4
Redox: which statement is NOT true?
- A. In a displacement reaction, the more reactive metal is oxidised.
- B. A metal atom becoming a positive ion is reduced.
- C. Reduction is the gain of electrons.
- D. Oxidation and reduction always happen together.
5
Question 5
Iron is added to a solution containing silver ions and displaces the silver. Which species is reduced?
- A. iron atoms
- B. silver ions
Question 6
Complete the half-equation at the cathode: Na⁺ + ? e⁻ → Na. How many electrons are needed?
Answer
7
Question 7
Redox: which statement is NOT true?
- A. Reduction always means gaining oxygen.
- B. In a displacement reaction, the more reactive metal is oxidised.
- C. Reduction is the gain of electrons.
- D. Oxidation is the loss of electrons.
8
Question 8
Iron is added to a solution containing silver ions and displaces the silver. Which species is oxidised?
- A. iron atoms
- B. silver ions
Question 9
Complete the half-equation at the cathode: Zn²⁺ + ? e⁻ → Zn. How many electrons are needed?
Answer
10
Question 10
Redox: which statement is NOT true?
- A. In a displacement reaction, the more reactive metal is oxidised.
- B. A metal atom becoming a positive ion is reduced.
- C. Oxidation and reduction always happen together.
- D. Oxidation is the loss of electrons.
11
Question 11
Zinc is added to a solution containing iron ions and displaces the iron. Which species is oxidised?
- A. zinc atoms
- B. iron ions
Question 12
Complete the half-equation at the cathode: Zn²⁺ + ? e⁻ → Zn. How many electrons are needed?
Answer
13
Question 13
Redox: which statement is NOT true?
- A. Oxidation is the loss of electrons.
- B. Reduction is the gain of electrons.
- C. Reduction always means gaining oxygen.
- D. In a displacement reaction, the more reactive metal is oxidised.
14
Question 14
Magnesium is added to a solution containing zinc ions and displaces the zinc. Which species is reduced?
- A. magnesium atoms
- B. zinc ions
Question 15
Complete the half-equation at the cathode: Al³⁺ + ? e⁻ → Al. How many electrons are needed?
Answer
16
Question 16
Redox: which statement is NOT true?
- A. In a displacement reaction, the more reactive metal is oxidised.
- B. At the anode, ions gain electrons.
- C. Oxidation is the loss of electrons.
- D. Reduction is the gain of electrons.

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Answer key: Oxidation, reduction and half-equations

1. C. Reduction always means gaining oxygen.
2. B. copper ions
3. 3
4. B. A metal atom becoming a positive ion is reduced.
5. B. silver ions
6. 1
7. A. Reduction always means gaining oxygen.
8. A. iron atoms
9. 2
10. B. A metal atom becoming a positive ion is reduced.
11. A. zinc atoms
12. 2
13. C. Reduction always means gaining oxygen.
14. B. zinc ions
15. 3
16. B. At the anode, ions gain electrons.