A-LevelChemistryElectrochemistryMay/June 2017Paper 1 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
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The correct answer is C. This question tests the candidate's understanding of electrochemistry within the Chemistrysyllabus. The examiner's mark scheme requires...
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