A-LevelChemistryChemical periodicityOct/Nov 2010Paper 1 Q321 Mark
Zirconium, Zr, proton number 40, is a metal which is used in corrosion-resistant alloys. Zirconium metal is extracted from the oxide ZrO₂ by the following sequence of reactions. reaction 1 ZrO₂ + 2Cl₂ + 2C → ZrCl₄ + 2CO reaction 2 ZrCl₄ + 2Mg → Zr + 2MgCl₂ Which statements about this extraction process are correct? 1 Carbon in reaction 1 behaves as a reducing agent. 2 Magnesium in reaction 2 behaves as a reducing agent. 3 Chlorine in reaction 1 behaves as a reducing agent.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of chemical periodicity within the Chemistrysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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