Which one of the following will produce a pink colour in a discharge tube?
Correct answer: C. Helium
- A. Neon
- B. Nitrogen
- C. Helium
- D. Oxygen
Explanation
A tube containing charged electrodes and filled with a gas in which ionization is induced by an electric field. The gas molecules emit light as they return to the ground state. Each gas has a characteristic colour in the discharge tube, shown in the figure below. A) Neon has a red colour in the discharge tube. B) Nitrogen has a purple colour in the discharge tube. C) Helium has a pink colour in the discharge tube. D) Oxygen has a violet colour in the discharge tube. Therefore, C is the correct answer since He has a pink colour in the discharge tube.
This question appeared on the ETEA MDCAT 2005 paper, which you can sit online with every answer explained.
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