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CAIE A-Level Chemistry AS 12.1.2 And Explain Questions

Practise ammonia basicity, formation and structure of NH4+, and displacement of ammonia from ammonium salts.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Explain ammonia's Brønsted–Lowry basicity as acceptance of H⁺ by the nitrogen lone pair.
  • Describe formation of NH₄⁺ by proton transfer to NH₃ and its tetrahedral structure with four equivalent N–H bonds.
  • Write and explain the acid–base displacement of ammonia from an ammonium salt by a stronger base, including NH₄⁺ + OH⁻ → NH₃ + H₂O.

CAIE A-Level Chemistry AS 12.1.2 And Explain Questions question 1

[Maximum number: 1]

Ammonia reacts with acids to form the ammonium ion.

NH3+H+⇌NH4+\mathrm{NH}_{3}+\mathrm{H}^{+} \rightleftharpoons \mathrm{NH}_{4}^{+}

Which row is correct?

shape of NH4+\mathrm{NH}_{4}{ }^{+}

bond angle

in NH4+/∘\mathrm{NH}_{4}{ }^{+} /{ }^{\circ}

pyramidal

107

pyramidal

109.5

tetrahedral

107

tetrahedral

109.5

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