A-LevelChemistryGroup 2Oct/Nov 2017Paper 1 Q141 Mark
Radium is an element below barium in Group 2 of the Periodic Table. Which equation shows what happens when solid radium nitrate, Ra(NO3)2, is heated strongly?
ARa(NO3)2(s) → RaO(s) + N2O(g) + 2O2(g)
B2Ra(NO3)2(s) → 2RaO(s) + 2N2(g) + 5O2(g)
C2Ra(NO3)2(s) → 2RaO(s) + 4NO2(g) + O2(g)
D4Ra(NO3)2(s) → 2Ra2O(s) + 8NO2(g) + 3O2(g)
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of group 2 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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