A-LevelChemistryElectrochemistry9701/12 · May/June 2017 · Q31 Mark

In some fireworks there is a reaction between powdered aluminium and powdered barium nitrate. Heat is evolved, an unreactive gas is produced, and all nitrogen atoms are reduced. What is the equation for this reaction?

A2Al + Ba(NO₃)₂ → Al₂O₃ + BaO + 2NO

B4Al + 4Ba(NO₃)₂ → 2Al₂O₃ + 4Ba(NO₂)₂ + O₂

C10Al + 3Ba(NO₃)₂ → 5Al₂O₃ + 3BaO + 3N₂

D10Al + 18Ba(NO₃)₂ → 10Al(NO₃)₃ + 18BaO + 3N₂

✓ Correct answer

C: 10Al + 3Ba(NO₃)₂ → 5Al₂O₃ + 3BaO + 3N₂

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Topic: Electrochemistry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2017 Paper 1 Variant 2, question 3.

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