A-LevelChemistryGroup 2Feb/Mar 2020Paper 1 Q171 Mark
A student investigates calcium nitrate crystals by heating them in the apparatus shown. A colourless gas leaves the apparatus at Y. A flame is held to this gas. Which observations would the student make? [Figure 17.1]
Alitmus solution: changes to blue, flame at Y: flame burns more brightly
Blitmus solution: changes to blue, flame at Y: flame goes out
Clitmus solution: changes to red, flame at Y: flame burns more brightly
Dlitmus solution: changes to red, flame at Y: flame goes out
✓ 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...
📋 Examiner Report & Trap Analysis
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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