Question 46
Acids, Bases and SaltsA piece of sea shell, when dropped into a dilute solution of hydrochloric acid, produces a colourless, odourless gas which turns clear limewater milky. The sea shell contains
- A.sodium chloride
- B.ammonium nitrate
- C.calcium carbonate
- D.calcium chloride
- E.magnesium chloride
Show the answer and explanation
Answer: C (calcium carbonate)
Explanation
The gas that turns limewater milky is CO2, which comes from a carbonate reacting with acid. Sea shells are made of calcium carbonate.