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 ?

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

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

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.

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.

Colligative properties are properties of solution which depends on the number of solute particles in the solution. The value of van't Hoff factor, 'i', for aqueous KCl solution is close to 2, while the value of 'I' for ethanoic acid in benzene is nearly 0.5. Give reasons

Assertion : The molecular weight of acetic acid determined by depression in freezing point method in benzene and water was found to be different. Reason : water is polar and Benzene is non polar 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.

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 ?

Which one of the statements given below concerning properties of solutions, describes a colligative effect? a)Boiling point of pure water decreases by the addition of ethanol b)Vapour pressure of pure water decreases by the addition of nitric acid c)Vapour pressure of pure benzene decreases by the addition of naphthalene d)Boiling point of pure benzene increases by the addition of toluene