Name a common method to collect a gas produced in a school experiment and state one advantage.

• A. Collecting gas over water; advantage: simple setup and direct measurement of volume.
• B. Collecting gas with a gas syringe; advantage: accurate volume measurement.
• C. Collecting gas by upward displacement of air into a graduated tube; advantage: direct reading of volume.
• D. Collecting gas by passing through a filter; advantage: purity.

Answer: (C)