A-LevelChemistryGroup 29701/12 · Oct/Nov 2016 · Q351 Mark
Equal masses of barium carbonate and magnesium carbonate powders are mixed together. The mixture is then heated using a Bunsen burner flame until there is no further change. A gas is given off. Which statements are correct? 1 The residue left after heating reacts with aqueous hydrochloric acid to produce carbon dioxide. 2 The percentage decrease in mass after heating is 26% (to 2 significant figures). 3 The gas given off during heating relights a glowing splint.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct answer
B: 1 and 2 only are correct
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