A-LevelChemistryGroup 29701/12 · Oct/Nov 2010 · Q151 Mark
Which statement explains the observation that magnesium hydroxide dissolves in aqueous ammonium chloride, but not in aqueous sodium chloride?
AThe ionic radius of the NH₄⁺ ion is similar to that of Mg²⁺ but not that of Na⁺.
BNH₄Cl dissociates less fully than NaCl.
CThe Na⁺ and Mg²⁺ ions are isoelectronic (have the same number of electrons).
DThe NH₄⁺ ion can donate a proton.
✓ Correct answer
D: The NH₄⁺ ion can donate a proton.
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