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?

Q: What topic does this question test?

This question tests Group 2 in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2010 examination, Paper 1 Variant 2 (9701_w10_qp_12.pdf).

Question

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?

Oracle Prep · Accepted Answer

The correct answer is D: T_d Sr, ∆pH Sr.

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