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Chemistry
What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH1), sodium sulphide (pH2), sodium selenide (pH3) and sodium telluride (pH4) ?
Q. What is the correct relationship between the
p
Hs
of isomolar solutions of sodium oxide
(
p
H
1
)
,
sodium sulphide
(
p
H
2
)
,
sodium selenide
(
p
H
3
)
and sodium telluride
(
p
H
4
)
?
3058
196
AIIMS
AIIMS 2008
The p-Block Elements - Part2
Report Error
A
p
H
1
>
p
H
2
=
p
H
3
=
p
H
4
15%
B
p
H
1
<
p
H
2
<
p
H
3
<
p
H
4
18%
C
p
H
1
<
p
H
2
>
p
H
3
<
p
H
4
14%
D
p
H
1
>
p
H
2
>
p
H
3
>
p
H
4
52%
Solution:
l
N
a
2
O
+
H
2
O
→
2
N
a
O
H
ll
N
a
2
S
+
H
2
O
→
2
N
a
O
H
+
H
2
S
llI
N
a
2
S
e
+
H
2
O
→
2
N
a
O
H
+
H
2
S
e
IV
N
a
2
T
e
+
H
2
O
→
2
N
a
O
H
+
H
2
T
e
will have the highest pH. Among
H
2
S
,
H
2
S
e
,
H
2
Te acidity goes on increasing on going down the group as bond length increases on increasing size of central atom.
So,
p
H
4
<
p
H
3
<
p
H
2
Overall order is
p
H
1
>
p
H
2
>
p
H
3
>
p
H
4