A-LevelChemistryGroup 179701/12 · Feb/Mar 2025 · Q231 Mark

Which graph correctly describes a trend found in Group 17? [X represents a halogen atom.]

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Agraph showing bond length in X2 decreasing as the halogen atom's period increases from Cl to I

Bgraph showing strength of van der Waals' forces increasing as the halogen atom's period increases from Cl to I

Cgraph showing boiling point of X2 decreasing as the halogen atom's period increases from Cl to I

Dgraph showing bond energy of HX decreasing as the halogen atom's period increases from Cl to I

✓ Correct answer

B: graph showing strength of van der Waals' forces increasing as the halogen atom's period increases from Cl to I

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Topic: Group 17, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2025 Paper 1 Variant 2, question 23.

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