A-LevelChemistryGroup 29701/12 · May/June 2018 · Q361 Mark
Solid barium oxide is added to some ammonium sulfate solution in a test-tube and the mixture is warmed. A piece of damp red litmus paper is held over the mouth of the test-tube. Which observations would be made? 1 The damp litmus paper initially turns from red to blue. 2 A white precipitate forms in the test-tube. 3 A brown gas is evolved with strong heating.
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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