A-LevelChemistryGroup 2Oct/Nov 2021Paper 1 Q191 Mark
Magnesium hydroxide dissolves in aqueous ammonium chloride, but not in aqueous sodium chloride. Which statement explains this observation?
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 have the same number of electrons.
DThe NH4⁺ ion can donate a proton.
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The correct answer is D. This question tests the candidate's understanding of group 2 within the Chemistrysyllabus. The examiner's mark scheme requires...
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