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Which of the following gases can best be used for demonstrating the fountain experiment?

• i. Nitrogen
• ii. Ammonia
• iii. Nitrogen(ii)oxide
• iv. Hydrogen chloride

A. (ii) and (iii)

B. (i) and (iii)

C. (ii) and (iv)

D. (ii) only

QUICK ANSWER…

C

SOLUTION…  

The fountain experiment is an experimental set up used to demonstrate the high solubility of a gas in water.

Gasses like ammonia and hydrogen chloride are so high in solubility that they are used in fountain experiment. A highly soluble gas will cause sprinkles of fountain to form as the force of solubility draws up water from a lower flask.

Now for the right answer to the above question:

1. Option A is incorrect. Nitrogen (ii) oxide is not soluble enough to cause a fountain.
2. Option B is incorrect. Nitrogen (ii) oxide and Nitrogen are not soluble enough to cause a fountain.
3. C is correct. Ammonia and hydrogen chloride are so soluble that they cause sprinkles in the upper flask of a fountain experimental set up.
4. D is not the correct answer. Not ammonia alone, hydrogen chloride can also be used for fountain experiment.

QUICK TIPS…

You may please note these/this:

• In fountain experiment, high solubility of a gas in water causes sprinkles and fountains to form.

Use the questions and answers session to raise further questions and deal more on this topic…

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/ culled from 2017 JAMB-UTME Chemistry question 19 /