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Air pollution: gaseous pollutants, acid rain, smog
JEE Main level
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Difficulty 2 of 3
ev012
The first step of the chain of reactions leading to photochemical smog is the photolysis
NO
X
2
h
ν
X
+
Y
. The species
X
and
Y
are
A
NO
and
O
(atom)
B
NO
X
3
and
H
C
N
X
2
and
O
X
2
D
N
and
O
X
2
Answer: A
Sunlight splits
NO
X
2
as
NO
X
2
NO
+
O
. The reactive oxygen atom then combines with
O
X
2
to give ozone. Elemental nitrogen is not formed at this stage.
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