Question:

Some reactions of $NO _2$ relevant to photochemical smog formation are
Identify $A , B , X$ and $Y$

Updated On: Mar 21, 2025

$X =[ O ], Y = NO , A = O _2, B = O _3$
$X = N _2 O , Y =[ O ], A = O _3, B = NO$
$X =\frac{1}{2} O _2, Y = NO _2, A = O _3, B = O _2$
$X = NO , Y =[ O ], A = O _2, B = N _2 O _3$

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The Correct Option is A

Solution and Explanation

1. NO$_2$ dissociates in sunlight: \[ \text{NO$_2$ $\xrightarrow{\text{sunlight}}$ NO + O.} \]
2. O reacts with O$_2$ to form ozone: \[ \text{O + O$_2$ $\rightarrow$ O$_3$.} \]
Thus, X = O, Y = NO, A = O$_2$, and B = O$_3$. In photochemical smog formation, NO$_2$ dissociates into NO and O under sunlight. Atomic oxygen reacts with O$_2$ to form O$_3$ (ozone).

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Concepts Used:

Atmospheric Pollution

The pollution that directly harms living organisms is the atmospheric pollution, air is more essential than food when it comes to the survival of life on earth. Atmospheric pollution is, consequently, a major concern for life on the planet. The most common type of air pollution that affects much of the world is Smog (smoke + fog).
Pollution is the outcome of undesired changes in the environment with harmful effects on plants, animals, and humans. The element that causes pollution is commonly known as pollutants.
Pollutants may be solids, liquids, or gases that are present in large quantities in nature and produced due to human activities or natural circumstances.
For instance, materials such as dichlorodiphenyltrichloroethane (DDT), heavy metals, chemicals, plastic materials, nuclear waste, etc., once disclosed to the environment it is difficult to remove.

Causes of Atmospheric Pollution:

There is a number of factors that contribute to the pollution of the environment. Some of the major causes of atmospheric pollution are given below -

Industrial waste
Usage of pesticides
Deforestation
Combustion of fuels
Nuclear Explosions
Use of Toxic Solvents

Some reactions of $NO _2$ relevant to photochemical smog formation are Identify $A , B , X$ and $Y$