Question

Van't Hoff factor is:

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

Answer 1

Answer: (D)

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 $\text{C}.$