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Standard XII
Chemistry
Van't Hoff Factor
For which amo...
Question
For which among the following equimolar aqueous solutions Van't Hoff factor has the lowest value?
A
Aluminium Chloride
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B
Potassium Sulphate
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C
Ammonium Chloride
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D
Urea
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Solution
The correct option is
D
Urea
For the aqueous solution of urea, van't Hoff factor has the lowest value.
Urea is non-electrolyte and does not dissociate in aqueous solution. Hence, Van't Hoff factor is
1.
For aluminium chloride
A
l
C
l
3
,
i
=
4
A
l
C
l
3
→
A
l
3
+
+
3
C
l
−
For potassium sulphate
K
2
S
O
4
,
i
=
3
K
2
S
O
4
→
2
K
+
+
S
O
2
−
4
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0
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