A-LevelChemistryChemical bonding9701/12 · May/June 2017 · Q181 Mark

The ammonium ion is formed by the following reaction. NH₃ + H⁺ → NH₄⁺ Which statement about the species involved in this reaction is correct?

AThe ammonia molecule contains a dative covalent bond.

BThe ammonium ion is a Brønsted-Lowry base as it has accepted a proton.

CThe H-N-H bond angle changes from 107° in ammonia to 90° in the ammonium ion.

DThe number of electrons surrounding each nitrogen atom does not change.

✓ Correct answer

D: The number of electrons surrounding each nitrogen atom does not change.

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Topic: Chemical bonding, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2017 Paper 1 Variant 2, question 18.

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