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p-Block Elements: Groups 15 and 16
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Structures of oxyacids and oxides
JEE Main level
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Difficulty 2 of 3
pn208
The total basicity of
H
X
3
PO
X
2
,
H
X
3
PO
X
3
and pyrophosphoric acid
H
X
4
P
X
2
O
X
7
(sum of the three values) is
A
9
B
6
C
7
D
8
Answer: C
H
X
3
PO
X
2
has one P-OH (basicity 1),
H
X
3
PO
X
3
has two (basicity 2) and
H
X
4
P
X
2
O
X
7
has four P-OH groups (basicity 4). The sum is
1
+
2
+
4
=
7
.
Practice p-Block Elements: Groups 15 and 16
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