Correct Answer: Option A

Explanation

- Two gases that can be used in the study of fountain experiment is ammonia gas and hydrogen chloride gas.

- Ammonia dissolves into the water and the pressure in the container drops. As a result, more water is forced into the container from another inlet creating a fountain effect.

- All the hydrogen chloride in the flask dissolves in the water drops from the pipette, creating a vacuum in the flask. Water is then sucked up at great speed from the bowl, creating a spectacular 'fountain' in the flask.

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