Question

A liquid possesing which of the following characterstics will be most suitable for determining the molecular mass of a compound by cryoscopic measurements?

• A. That having low freezing point and small enthalpy of freezing.
• B. That having high freezing point and small enthalpy of freezing.
• C. Greater than the normal boiling point of either of the liquid.
• D. Smaller than the normal boiling point of either of the liquid.

Answer 1

The correct option is B That having high freezing point and small enthalpy of freezing.

If $\Delta T_f$ is high less error will be in measurement, also $K_f$ should be high.
Therefore, $T_f$ should be high and ${\Delta }_{fus}H$ should be low.