A-LevelChemistryChemical bonding9701/12 · May/June 2011 · Q21 Mark

Which diagram correctly shows the bonding in the ammonium ion, NH4+? key • N electron × H electron [Figure 2.1]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

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

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]

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Topic: Chemical bonding, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2011 Paper 1 Variant 2, question 2.

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