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SAT
>>
Chemistry
>>
chemical equilibrium
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Q)
Three reaction involving
H
2
P
O
4
are given below
(
i
)
H
3
P
O
4
+
H
2
O
⇌
H
3
O
+
+
H
2
P
O
−
4
(
i
i
)
H
2
P
O
4
+
H
2
O
⇌
H
P
O
−
2
4
+
H
+
3
O
(
i
i
i
)
H
2
P
O
4
+
O
H
⇌
H
3
P
O
4
+
O
2
−
In which of the above does
H
2
P
O
4
act as an acid
(
a
)
(
i
)
o
n
l
y
(
b
)
(
i
i
)
o
n
l
y
(
c
)
(
i
i
i
)
o
n
l
y
(
d
)
(
i
v
)
o
n
l
y
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