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Tardigrade
Question
Chemistry
HgCl2 and I2 both when dissolved in water containing I- ions the pair of species formed is :
Q.
H
g
C
l
2
and
I
2
both when dissolved in water containing
I
−
ions the pair of species formed is :
3595
199
NEET
NEET 2017
The d-and f-Block Elements
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A
H
g
I
2
,
I
−
17%
B
H
g
I
4
2
−
,
I
3
−
57%
C
H
g
2
I
2
,
I
−
12%
D
H
g
I
2
,
I
3
−
14%
Solution:
In a solution containing
H
g
C
l
2
,
I
2
and
I
−
, both
H
g
C
l
2
and
I
2
compete for
I
−
.
Since formation constant of
[
H
g
l
4
]
2
−
is
1.9
×
1
0
30
which is very large as compared with
I
3
−
(
K
f
=
700
)
∴
I
−
will preferentially combine with
H
g
C
l
2
.
H
g
C
l
2
+
2
I
−
→
Red ppt
H
g
l
2
↓
+
2
C
l
−
H
g
l
2
+
2
I
−
→
soluble
[
H
g
l
4
]
2
−