Edexcel A-Level Chemistry AS 8.8 Oxidation Number Is a Useful Concept in Terms of the Classification of Reactions As Redox and As Disproportionation Questions

Use marked Edexcel IAL Chemistry questions to classify redox reactions from oxidation-number increases and decreases, and distinguish disproportionation from other redox changes.

Exam points

Classify redox by showing that at least one oxidation number increases and another decreases.
Distinguish disproportionation by checking whether one starting species undergoes both changes.

[Maximum number: 1]

Which reaction is not a redox reaction?

$4 \mathrm{KClO}_{3}(\mathrm{~s}) \rightarrow 3 \mathrm{KClO}_{4}(\mathrm{~s})+\mathrm{KCl}(\mathrm{s})$

$2 \mathrm{HCl}(\mathrm{aq})+\mathrm{Ba}(\mathrm{OH})_{2}(\mathrm{aq}) \rightarrow \mathrm{BaCl}_{2}(\mathrm{aq})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})$

Zn(s) $+\mathrm{CuSO}_{4}(\mathrm{aq}) \rightarrow \mathrm{ZnSO}_{4}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})$

$\mathrm{Cl}_{2}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{HCl}(\mathrm{aq})+\mathrm{HClO}(\mathrm{aq})$

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Edexcel A-Level Chemistry AS 8.8 Oxidation Number Is a Useful Concept in Terms of the Classification of Reactions As Redox and As Disproportionation Questions question 1