A-LevelChemistryGroup 17May/June 2013Paper 1 Q191 Mark
The halogens exist as diatomic molecules, X₂. The boiling points of the Group VII elements increase as the group is descended from chlorine to iodine. Which statement helps to explain this increase in boiling point as Group VII is descended?
AThe electronegativity of X decreases as the group is descended.
BThe number of electrons in each X₂ molecule increases as the group is descended.
CThe size of the permanent dipole in the X₂ molecule increases as the group is descended.
DThe X–X bond strength increases as the group is descended.
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of group 17 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep