Which of the following gases, in pure form, has a slightly blue colour?
A
Ozone
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
Oxygen
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Carbon dioxide
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Hydrogen
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is C Ozone
Ozone gas has a slightly blue color. It is dark blue in a liquid form and purple-black in solid form.
The color comes from the fact that it absorbs all wavelengths of light other than those in the blue region. As the phase changes, the molecules get closer together, shifting the area of absorption, changing the color of the material.