Question

The pale blue colour of cozone gas is due to the intense absorption of

• A. rusmic ndation
• B. blue light
• C. red light
• D. haved radation

Answer 1

Answer: (C)

red light

Answer 2

The pale blue color of ozone gas is due to the selective absorption of certain wavelengths of visible light. When white light passes through ozone, it absorbs light from the red and orange parts of the visible spectrum. The light that is not absorbed (i.e., transmitted) is predominantly blue, which is why ozone appears pale blue.

The Chappuis band of ozone absorption is responsible for its blue color. This band absorbs light primarily in the yellow, orange, and red regions of the spectrum (approximately 450-750 nm, with a peak around 600 nm). By absorbing these longer wavelengths, the shorter wavelengths (blue and violet) are transmitted, giving ozone its characteristic pale blue appearance.