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Air pollution: gaseous pollutants, acid rain, smog
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Difficulty 1 of 3
ev011
In the atmosphere,
SO
X
2
is oxidised to
SO
X
3
in the presence of particulate matter, and the
SO
X
3
then reacts with water vapour to give
A
H
X
2
S
X
2
O
X
3
B
H
X
2
SO
X
3
C
H
X
2
SO
X
4
D
H
X
2
S
Answer: C
The sequence is
2
SO
X
2
+
O
X
2
2
SO
X
3
(catalysed by particulates) followed by
SO
X
3
+
H
X
2
O
H
X
2
SO
X
4
. Sulphuric acid is the strong acid in acid rain.
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