A-LevelChemistryChemical bondingMay/June 2011Paper 1 Q21 Mark
Which diagram correctly shows the bonding in the ammonium ion, NH4+? key • N electron × H electron [Figure 2.1]
A[Diagram showing N with 4 covalent N-H bonds (each N•H×), with the + charge to the top right of the ion]
B[Diagram showing N with 4 covalent N-H bonds (each N•H×), with the + charge on one H atom]
C[Diagram showing N with 3 covalent N-H bonds (each N•H×) and one dative N→H bond (N••H), with the + charge near the N atom]
D[Diagram showing N with 4 covalent N-H bonds (each N•H×), with the + charge near the N atom, visually distinct from option C]
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of chemical bonding 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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