IGCSE Co-ordinated Sciences (Double Award) 0654 · Chemistry · 65

0654.C6.3.01 — Define redox reactions as involving simultaneous oxidation and reduction: past paper questions

12 real questionsasked in 5 of the last 10 exam series2020–2025usually: Which, Complete, What, Explain, State

Real questions on 0654.c6.3.01 — define redox reactions as involving simultaneous oxidation and reduction

The newest 12 of 12 written questions. Open one to see it on the real paper.

0654/02 · Specimen 2025 · Q2[1]
What conclusion can be drawn from the data?
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0654/02 · Specimen 2025 · Q18[1]
Which statement about the reaction is correct?
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0654/02 · Specimen 2025 · Q20[1]
Which statement defines reduction?
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0654/31 · October/November 2025 · Q7a(i)[2]
Explain why this reaction shows both oxidation and reduction.
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0654/43 · October/November 2025 · Q8a[2]
Iron( III ) oxide reacts with carbon monoxide. Complete the equation for the reduction of iron( III ) oxide.
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0654/32 · February/March 2025 · Q5b(ii)[2]
The concentration of the dilute hydrochloric acid used is 36.5 g / dm 3 . The experiment is repeated using acid with a concentration of 73.0 g / dm 3 . State the effect on the rate of reaction. Explain your answer. effect on rate of reaction explanation
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0654/43 · October/November 2024 · Q11d[2]
Magnesium displaces copper from copper chloride solution. The ionic equation for the reaction is shown. Mg + Cu 2+ Mg 2+ + Cu Explain why the reaction between magnesium atoms and copper ions involves both oxidation and reduction.
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0654/43 · October/November 2024 · Q11e[1]
Complete the following sentences about oxidising agents and reducing agents. An oxidising agent is a substance which another substance during a redox reaction. A reducing agent is a substance which another substance during a redox reaction.
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0654/12 · May/June 2023 · Q19[1]
Which type of reaction occurs?
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0654/21 · May/June 2021 · Q19[1]
Which equation represents a redox reaction?
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0654/22 · May/June 2021 · Q19[1]
Which changes show oxidation?
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0654/11 · October/November 2020 · Q19[1]
Which word equation represents a redox reaction?
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What examiners said

Most candidates used the data given in the question to explain that there was an increase in the rate of reaction because the hydrochloric acid was more concentrated.
— Examiner report, February/March 2025, 0654/32 Q5(b)(ii) (Cambridge)

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In the syllabus

65 0654.C6.3.01 — Define redox reactions as involving simultaneous oxidation and reduction

Define redox reactions as involving simultaneous oxidation and reduction
Define oxidation as gain of oxygen and 5 Define oxidation in terms of: reduction as loss of oxygen (a). loss of electrons (b). an increase in oxidation number (determination of oxidation numbers is not required)
Identify redox reactions as reactions involving gain and loss of oxygen
Identify oxidation and reduction in redox reactions. (Oxidation number limited to its use to name ions, e.g. iron(II), iron(III), copper(II).)
Define reduction in terms of: (a). gain of electrons (b). a decrease in oxidation number (determination of oxidation numbers is not required)

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