Question

Van't Hoff factor is:

• A. $\text{more than one in case of association}$
• B. $\text{less than one in case of dissociation}$
• C. $\frac{\text{normal molecular mass}}{\text{observed molecular mass}}$
• D. $\frac{\text{observed molecular mass}}{\text{normal molecular mass}}$

Answer 1

Answer: (C)

$\frac{\text{normal molecular mass}}{\text{observed molecular mass}}$

The van 't Hoff factor is a measure of the effect of a solute upon colligative properties such as osmotic pressure, relative lowering in vapour pressure, the elevation of boiling point and freezing point depression.

The van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass.

$=\frac{\text{normal molecular mass}}{\text{observed molecular mass}}$

Hence, the correct option is $\text{C}.$