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Question
Chemistry
For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point ?
Q. For
1
molal aqueous solution of the following compounds, which one will show the highest freezing point ?
4130
170
JEE Main
JEE Main 2018
Solutions
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A
[
C
o
(
H
2
O
)
6
]
C
l
3
19%
B
[
C
o
(
H
2
O
)
5
Cl
]
C
l
2
.
H
2
O
17%
C
[
C
o
(
H
2
O
)
4
C
l
2
]
Cl
.
2
H
2
O
16%
D
[
C
o
(
H
2
O
)
3
C
l
3
]
.
3
H
2
O
49%
Solution:
The solution which shows maximum freezing point must have minimum number of solute particles.
(1)
[
C
o
(
H
2
O
)
6
]
C
l
3
→
[
C
o
(
H
2
O
)
6
]
3
+
+
3
C
l
−
,
i
=
4
(2)
[
C
o
(
H
2
O
)
5
Cl
]
C
l
2
⋅
H
2
O
→
[
C
o
(
H
2
O
)
5
Cl
]
2
+
+
2
C
l
−
,
i
=
3
(3)
[
C
o
(
H
2
O
)
4
C
l
2
]
Cl
⋅
2
H
2
O
→
[
C
o
(
H
2
O
)
4
C
l
2
]
+
+
Cl
,
i
=
2
(4)
[
C
o
(
H
2
O
)
3
C
l
3
]
⋅
3
H
2
O
→
[
C
o
(
H
2
O
)
3
C
l
3
]
,
i
=
1
So, solution of
1
molal
[
C
o
(
H
2
O
)
3
C
l
3
]
⋅
3
H
2
O
will have minimum number of particles in aqueous state.