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AIEEE 2010 Solved Paper
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© examsnet.com
Question : 7
Total: 89
Three reactions involving
H
2
PO
4
−
are given below :
(i)
H
3
PO
4
+
H
2
O
→
H
3
O
+
+
H
2
PO
4
−
(ii)
H
2
PO
4
−
+
H
2
O
→
HPO
4
2
−
+
H
3
O
+
(iii)
H
2
PO
4
−
+
OH
−
→
H
3
PO
4
+
O
2
−
In which of the above does
H
2
PO
4
−
act as an acid?
(ii) only
(i) and (ii)
(iii) only
(i) only
Validate
Solution:
(i)
H
3
PO
4
acid
1
+
H
2
O
4
base
2
→
H
3
O
acid
2
+
+
H
2
PO
4
base
1
−
(ii)
H
3
PO
4
−
acid
1
+
H
2
O
base
2
→
HPO
4
−
base
1
+
H
3
O
acid
2
+
(iii)
H
2
PO
base
1
4
−
+
OH
−
acid
2
→
H
3
PO
4
acid
1
+
O
−
−
base
2
Hence only in
(
ii
)
reaction
H
2
PO
4
−
is acting as an acid.
© examsnet.com
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