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Edexcel A-Level Chemistry A2 16.1 The Terms Oxidation and Reduction in Terms of Electron Transfer and Changes in Oxidation Number Applied to S P Questions

Practise Edexcel IAL Chemistry 16.1 by tracking oxidation-number changes, identifying oxidation and reduction, and interpreting balanced redox equations and half-cells.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Use oxidation-number changes to justify whether a reaction is redox or not.
  • Link reduction to electron gain and a decrease in oxidation number in MCQ contexts.
  • Identify which species is oxidised or reduced from balanced equations or half-cells.
  • write or interpret balanced redox and ionic equations with correct oxidation states

Edexcel A-Level Chemistry A2 16.1 The Terms Oxidation and Reduction in Terms of Electron Transfer and Changes in Oxidation Number Applied to S P Questions question 1

[Maximum number: 2]

This question is about mercury, Hg, and its compounds.
Mercury is a liquid element in the same group of the Periodic Table as zinc.
The electronic configuration of mercury is [Xe]4f145 d106 s2[\mathrm{Xe}] 4 \mathrm{f}^{14} 5 \mathrm{~d}^{10} 6 \mathrm{~s}^{2}.

Mercury reacts with nitric acid to form an aqueous solution of Hg(NO3)2\mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2} and nitrogen monoxide gas.

The unbalanced equation is shown.

Hg(l)+HNO3(aq)→Hg(NO3)2(aq)+NO( g)+H2O(l)\mathrm{Hg}(\mathrm{l})+\mathrm{HNO}_{3}(\mathrm{aq}) \rightarrow \mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq})+\mathrm{NO}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})

Explain, using oxidation numbers, why this is a redox reaction.
(2)

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