Redox: past paper questions
Real questions on redox
The newest 20 of 376 written questions. Open one to see it on the real paper.
- 0620/31 · May/June 2026 · Q4c(ii)[1]
Identify the type of reaction that takes place when pentane reacts with chlorine. Draw a circle around your chosen answer. neutralisation redox addition substitution
See it on the paper → - 0620/31 · May/June 2026 · Q6c(i)[1]
Cobalt reacts with oxygen to form cobalt( III ) oxide. Complete the symbol equation for this reaction. Co + O 2 2Co 2 O 3 (c) (i)
See it on the paper → - 0620/32 · May/June 2026 · Q6c(i)[2]
Nickel reacts with oxygen to form nickel( II ) oxide. Complete the symbol equation for this reaction. Ni + 2NiO
See it on the paper → - 0620/33 · May/June 2026 · Q1a(ii)[1]
reacts with methane in a combustion reaction
See it on the paper → - 0620/33 · May/June 2026 · Q2b(i)[2]
Complete the symbol equation for this reaction. Br 2 + 2NaI + Aqueous bromine reacts with aqueous sodium iodide. (b) (i)
See it on the paper → - 0620/33 · May/June 2026 · Q2b(ii)[1]
Identify the type of reaction that takes place when aqueous bromine reacts with aqueous sodium iodide. Draw a circle around your chosen answer. addition displacement neutralisation substitution
See it on the paper → - 0620/33 · May/June 2026 · Q6c(i)[1]
Complete the symbol equation for this reaction. Ti + O 2 Titanium reacts with oxygen to form titanium( III ) oxide. 2Ti 2 O 3
See it on the paper → - 0620/41 · May/June 2026 · Q1a[1]
a reaction that occurs in the blast furnace
See it on the paper → - 0620/41 · May/June 2026 · Q1b[1]
a reaction catalysed by vanadium( V ) oxide
See it on the paper → - 0620/41 · May/June 2026 · Q1f[1]
a displacement reaction
See it on the paper → - 0620/41 · May/June 2026 · Q4a[3]
Write a symbol equation for the decomposition of aqueous hydrogen peroxide. Include state symbols.
See it on the paper → - 0620/41 · May/June 2026 · Q4b[2]
State what is meant by the term catalyst.
See it on the paper → - 0620/42 · May/June 2026 · Q1b(iii)[1]
can displace aqueous bromide ions.
See it on the paper → - 0620/42 · May/June 2026 · Q4c(i)[1]
Explain why this is not a redox reaction. (i)
See it on the paper → - 0620/42 · May/June 2026 · Q5b(i)[2]
State the colour and give the name of the precipitate formed when NH 3 (aq) is added to Cr 3+ (aq) ions. colour of precipitate
See it on the paper → - 0620/42 · May/June 2026 · Q5b(ii)[2]
When a few drops of NH 3 (aq) are added to Zn 2+ (aq) a white precipitate forms. Explain these observations. When a few drops of Zn 2+ (aq) are added to NH 3 (aq) no precipitate forms.
See it on the paper → - 0620/42 · May/June 2026 · Q5c(ii)[3]
Figure 5.1 shows an incomplete reaction profile diagram for the forward reaction. energy progress of reaction Figure 5.1 On Figure 5.1: • • write the formulas of the reactants and the products draw an arrow, labelled E a , to show the activation energy
See it on the paper → - 0620/42 · May/June 2026 · Q5c(iii)[4]
The equation for the forward reaction can be represented as shown. H N H + H F F F F F F F N F F + H H H F F F Table 5.1 bond N–H F–F N–F bond energy in kJ / mol 390 150 270 Use the bond energies in Table 5.1 and the ΔH value of –870 kJ / mol for the forward reaction to calculate the H–F bond energy. Use the following...
See it on the paper → - 0620/42 · May/June 2026 · Q6e(i)[1]
Name the acidified aqueous oxidising agent used in method 1.
See it on the paper → - 0620/43 · May/June 2026 · Q1b[1]
a reaction catalysed by nickel
See it on the paper →
What examiners said
Comprehensive responses • Many candidates knew that hydrogen gas is formed when a metal reacts with an acid. Limited responses • Some candidates did use other elements from the table including chlorine and oxygen.
— Examiner report, February/March 2026, 0620/32 Q1(b) (Cambridge)
Comprehensive responses • Many candidates could state that aluminium or boron forms an ion with a 3+ charge. Limited responses • Some candidates did not use the Periodic Table. The charge on the ion is 3+ so it would be from Group III.
— Examiner report, February/March 2026, 0620/32 Q1(c) (Cambridge)
Comprehensive responses • Most candidates knew that the correct answer was sodium. Limited responses • Some candidates did not add up the number of electrons given, and then, did not use the Periodic Table to look up the correct element.
— Examiner report, February/March 2026, 0620/32 Q1(d) (Cambridge)
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