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Chapter 15: Q15. (page 570)

Question: Nitric oxide, NO鈥�, is another radical also thought to cause ozone destruction by a similar mechanism. One source of NO鈥� in the stratosphere is supersonic aircraft whose jet engines convert small amounts of N2 and O2 to NO鈥�. Write the propagation steps for the reaction of O3 with NO鈥�

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Answer

Step by step solution

01

 Step 1: Ozone synthesis

Ozone is formed in the upper atmosphere by the reaction of oxygen molecules with oxygen atoms.

Ozone synthesis

02

 Step 2: Ozone decomposition

Ozone is also decomposed with sunlight back to these same two species

Ozone decomposition

03

Chain propagation

This is a step where a reactive intermediate is regenerated during the course of the reaction and NO鈥�radical is that reactive intermediate. When ozone (03) reacts with NO鈥�radical it decomposes to ONO complex and nascent oxygen atom.

The ONO complex generated further reacts with nascent oxygen atoms to release oxygen molecules and regenerate the NO鈥�radical. Thus, it resembles the process of how NO鈥�radical decomposes ozone.

Representation of steps

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