A liquid possessing which of the following characteristics 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 fusion
b.That having high freezing point and small enthalpy of fusion
c.That having hifh freezing point and small enthalpy of vapourization
d.That having large surface tension

Explanation

To determine the molecular mass of a compound using cryoscopic measurements, we need to analyze the characteristics of the liquid that would be most suitable for this purpose. The key factors to consider are the freezing point and the enthalpy of fusion of the liquid.

### Step-by-Step Solution:

1. **Understanding Cryoscopic Measurements**:
- Cryoscopic measurements are based on the depression of the freezing point of a solvent when a solute is dissolved in it. The extent of this depression is related to the number of solute particles in the solution.

2. **Key Factors in Cryoscopy**:
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