Q: Which equation best represents the photodissociation of ozone in the stratosphere?

$$O_3 + h$$\nu \rightarrow $$O_2 + O$

Question 1

Which region of the electromagnetic spectrum is primarily responsible for the photodissociation of stratospheric ozone ($$O_3$$)?

Accepted Answer

Ultraviolet

Question 2

According to the spectrum of solar radiation at Earth's surface, which atmospheric molecule is most responsible for absorption in the infrared region?

Accepted Answer

$$CO_2$$

Question 3

A patient develops cataracts after prolonged exposure to sunlight. Which part of the solar spectrum is most likely responsible for this damage?

Accepted Answer

Ultraviolet (UV)

Question 4

Which molecule is depicted in the second image, and what is its significance in the stratosphere?

Accepted Answer

$$O_3$$; protects life by absorbing UV radiation

Question 5

The solar spectrum at sea level shows a significant reduction in intensity compared to sunlight without atmospheric absorption. Which process is primarily responsible for this reduction in the UV region?

Accepted Answer

Absorption by $$O_3$$

Question 6

Which equation best represents the photodissociation of ozone in the stratosphere?

Accepted Answer

$$O_3 + h$$
u ightarrow $$O_2 + O$

Question 7

Which molecule is a free radical involved in biological signaling and also plays a role in atmospheric chemistry?

Accepted Answer

$$NO$$

Question 8

Which of the following is an example of an octet-rule exception found in the stratosphere?

Accepted Answer

$$BF_3$$

Question 9

Which molecule is most effective at absorbing infrared radiation and thus contributes to the greenhouse effect?

Accepted Answer

$$CO_2$$

Question 10

Which process leads to the formation of free radicals that can damage DNA in biological systems?

Accepted Answer

Exposure to UVB radiation

Question 11

Which molecule is responsible for the relaxation of smooth muscle cells in blood vessels, as discussed in the study materials?

Accepted Answer

$$NO$$

Question 12

Which of the following is a correct statement about the absorption bands in the solar spectrum at Earth's surface?

Accepted Answer

Water vapor ($$H_2O) $$absorbs in both the infrared and visible regions

Question 13

Which of the following best explains why the intensity of sunlight at sea level is lower than sunlight outside the atmosphere?

Accepted Answer

Absorption and scattering by atmospheric molecules

Question 14

Which molecule is most likely to be involved in the formation of photochemical smog in urban environments?

Accepted Answer

$$O_3$$

Question 15

Which of the following is a correct description of the role of antioxidants in biological systems?

Accepted Answer

They scavenge excess free radicals to prevent cellular damage

Question 16

Which molecule is depicted as a linear triatomic structure in the second image?

Accepted Answer

$$CO_2$$

Question 17

Which equation represents the Chapman cycle for ozone formation and destruction in the stratosphere?

Accepted Answer

All of the above are steps in the Chapman cycle

Question 18

Which molecule is NOT a greenhouse gas?

Accepted Answer

$$N_2$$

Question 19

Which of the following is a consequence of increased UV radiation reaching Earth's surface due to ozone depletion?

Accepted Answer

Increased incidence of skin cancer

Question 20

Which molecule is most likely to be found in the stratosphere as a result of human activity and is known to catalyze ozone destruction?

Accepted Answer

Chlorofluorocarbons (CFCs)

Stability and Reactivity of Stratospheric Molecules: Solar Radiation, Atmospheric Chemistry, and Molecular Structure

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