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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

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

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

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.

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

[Maximum number: 1]

Which reaction is not a redox reaction?

A

4KClO3( s)→3KClO4( s)+KCl(s)4 \mathrm{KClO}_{3}(\mathrm{~s}) \rightarrow 3 \mathrm{KClO}_{4}(\mathrm{~s})+\mathrm{KCl}(\mathrm{s})

B

2HCl(aq)+Ba(OH)2(aq)→BaCl2(aq)+2H2O(l)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})

C

Zn(s) +CuSO4(aq)→ZnSO4(aq)+Cu(s)+\mathrm{CuSO}_{4}(\mathrm{aq}) \rightarrow \mathrm{ZnSO}_{4}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})

D

Cl2( g)+H2O(l)→HCl(aq)+HClO(aq)\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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