Explain why the molecular masses of some substances determined with the help of colligative properties are lower than actual values.

Explain Why'the molecular masses of some substances determined with the help of colligative properties are Higher than actual values.

The value of molecular mass determined by colligative properties are sometimes incorrect. What is Van't Hoff factor ?

Colligative properties can be used to determine the molecular mass of solutes in solutions. For determining the molecular mass of polymers, osmotic pressure is preffered to other properties. Why ?

Assertion : Molecular mass of KCl calculated on the basis of colligative properties will be lower than the normal molecular mass. Reason : Experimentally determined molar mass is always lower than the true value. a)If both (A) and (R) are correct and (R) is the correct explanation of(A). b)If both (A) and (R) are correct, but (R) is not the correct explanation of (A). c)If (A) is correct, but (R) is incorrect. d)If both (A) and (R) are incorrect.

When does the measurement of colligative properties of a solution leads to abnormal molecular masses?

The value of molecular mass determined by colligative properties are sometimes incorrect. Explain how these abnormalities occur in the case of benzoic acid in benzene and KCl in water ?