A-LevelChemistryGroup 2Oct/Nov 2010Paper 1 Q121 Mark
Equimolar quantities of magnesium carbonate and strontium carbonate are separately heated to bring about complete thermal decomposition. The minimum temperature for this to occur is called T_d. The cold residues are separately added to equal volumes of water and the change in pH is measured. The change in pH is called ∆pH. Which metal has the higher value of T_d, and the greater value of ∆pH?
AT_d Mg, ∆pH Mg
BT_d Mg, ∆pH Sr
CT_d Sr, ∆pH Mg
DT_d Sr, ∆pH Sr
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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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