A-LevelChemistryGroup 17May/June 2018Paper 1 Q141 Mark
In this question, X represents an atom of chlorine, bromine or iodine. Which explanation for the variation in volatility down Group 17 is correct?
AInstantaneous dipole-induced dipole forces between molecules become stronger.
BPermanent dipole-permanent dipole forces between molecules become stronger.
CThe bond energy of the X2 molecules decreases.
DThe first ionisation energy X(g) → X⁺(g) + e⁻ decreases.
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of group 17 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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