The freezing point order of the solution of glucose is and why

a) 10%3%>2%>1%
B) 1%>2%>3%>10%
c)1%>3%>10%>2%
d)10%>1%>3%>2%

Question

The freezing point order of the solution of glucose is and why

a) 10%3%>2%>1%
B) 1%>2%>3%>10%
c)1%>3%>10%>2%
d)10%>1%>3%>2%

Vartika Jain · Accepted Answer

Dear Student,

We know that,∆T= Kfm where, ∆T is the change in freezing pointKf=molal depression constantm = molalityNow, molality,m = Number of moles of solute×1000Mass of solvent(g)Let the mass of solvent be 100 gThen 10% solution of glucose means 10 g of glucose in 100g of waterSImilarly, 3% solution means 3 g of glucose in 100 g water2% solution means 2 g of glucose in 100 g water1% solution means 1 g of glucose in 100 g of water
Therefore, Mass of solvent = 100 gand, Number of moles=Mass of glucoseMolar mass of glucoseMolar mass of glucose is same for all the cases, it is only the mass of glucose that varies
Number of moles is directly proportional to mass of glucose, greater the mass greater will be the moles, and number of moles is directly proportional to molality, greater the number of moles greater will be the molality
Therefore, 10% solution will have greater molality than 3% than 2% and than 1%
This means that the change in freezing point i
e
 ∆T will be greatest for 10% solution than 3% than 2% and than 1%
Greater the change less will be the freezizng point as there is depression in freezing point on addition of solute
Hence, the freezing point order is B) 1%>2%>3%>10%

The freezing point order of the solution of glucose is and why a) 10%3%>2%>1% B) 1%>2%>3%>10% c)1%>3%>10%>2% d)10%>1%>3%>2%

The freezing point order of the solution of glucose is and why

a) 10%3%>2%>1%
B) 1%>2%>3%>10%
c)1%>3%>10%>2%
d)10%>1%>3%>2%