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Question
Biology
Rain is called acid rain when its pH is below
Q. Rain is called acid rain when its pH is below
1382
234
Punjab PMET
Punjab PMET 2008
Report Error
A
7
B
6.5
C
6
D
5.6
Solution:
Acid rain results from air pollution by oxides of nitrogen
(
N
O
x
)
and sulphur
(
S
O
x
)
. These gases react with water and form acids.
S
O
2
+
H
2
O
⟶
H
2
S
O
3
S
O
3
+
H
2
O
⟶
H
2
S
O
4
N
2
O
5
+
H
2
O
⟶
H
N
O
3
When the
p
H
of rain is below
5.6
, it is called acid rain.