A-LevelChemistryChemical bondingFeb/Mar 2017Paper 1 Q311 Mark
Nitrogen and phosphorus are both in Group 15 of the Periodic Table. Phosphorus forms a chloride with the formula PCl₅ but nitrogen does not form NCl₅. Which statements help to explain this? 1 Nitrogen's outer shell cannot contain more than eight electrons. 2 Nitrogen cannot have an oxidation state of +5. 3 Nitrogen is less electronegative than phosphorus.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
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The correct answer is D. This question tests the candidate's understanding of chemical bonding 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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