A-LevelChemistryChemical periodicity9701/12 · Feb/Mar 2017 · Q351 Mark
Three test-tubes, X, Y, and Z, each contain a small amount of water. • A small amount of NaCl is added to test-tube X. • A small amount of SiCl₄ is added to test-tube Y. • A small amount of AlCl₃ is added to test-tube Z. After a short time, two drops of Universal Indicator solution are added to each test-tube. Which observations are made? 1 The indicator added to test-tube X stays green. 2 The indicator added to test-tube Y turns red. 3 The indicator added to test-tube Z turns red.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct answer
A: 1, 2 and 3 are correct
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