When the pressure of the gas in a discharge tube is gradually lowered; which of the following are correct?

I. there is a violet glow in the tube

II. the glow in the tube splits into bands which get further apart.

III. the glow and the bands eventually disappear and there is a green fluorescence in the tube.

IV. the tube breaks into pieces.

A. I and II only
B. I and III only
C. I and IV only
D. I, II and III only
E. I, II III and IV

Correct Answer:

Option B – I and III only