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Question
Chemistry
The extent of charge of lead accumulator is determined by
Q. The extent of charge of lead accumulator is determined by
2119
199
EAMCET
EAMCET 2013
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A
amount of
P
b
S
O
4
in the battery
B
amount of
P
b
O
2
in the battery
C
specific gravity of
H
2
S
O
4
of the battery
D
amount of
P
b
in the battery
Solution:
In a fully charged lead accumulator or lead storage battery, sulphuric acid has a specific gravity (i.e., density that varies from
1.260
to 1.285. But during discharge (i.e., when the battery is in use).
H
2
S
O
4
is used up.
P
b
(
s
)
+
P
b
O
2
(
s
)
+
4
H
+
(
a
q
)
+
2
S
O
4
2
−
(
a
q
)
⟶
2
P
b
S
O
4
(
l
)
+
2
H
2
O
As a result, the specific gravity of
H
2
S
O
4
falls when it falls below
1.230
the battery needs recharging.