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CAIE A-Level Chemistry 6.1.3 Redox Terminology

Practise classifying oxidation, reduction and disproportionation from electron transfer and oxidation-number changes.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • identify oxidation by electron loss or oxidation-number increase and reduction by gain or decrease
  • show that oxidation and reduction occur together by tracking the species exchanging electrons
  • recognise disproportionation when one oxidation state of an element forms both higher and lower states

6.1.3 Redox Terminology question 1

[Maximum number: 1]

Nitrogen and phosphorus are elements in Group 15 of the Periodic Table.

A common test for nitrates is the reaction with NaOH and Al . Equation 1 shows the reaction.

 equation 13NO3−+8Al+5OH−+18H2O→3NH3+8[Al(OH)4]−\text { equation } 1 \quad 3 \mathrm{NO}_{3}^{-}+8 \mathrm{Al}+5 \mathrm{OH}^{-}+18 \mathrm{H}_{2} \mathrm{O} \rightarrow 3 \mathrm{NH}_{3}+8\left[\mathrm{Al}(\mathrm{OH})_{4}\right]^{-}

Identify the species that is oxidised in equation 1.

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