Question

Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature ?

• A. Electrolysis
• B. Chromatography
• C. Distillation
• D. Zone refining

Answer 1

The Correct Option is C

To determine the method used to obtain a highly pure metal that is liquid at room temperature, we need to consider the properties and application of each option provided.

1. Electrolysis: This method is primarily used for extracting metals from their ores or refining metals. It is not typically used for metals that are already in a liquid state at room temperature.
2. Chromatography: This technique is mainly used to separate mixtures into their individual components based on their movement through a stationary phase. It is not commonly used for purifying metals, especially not liquid metals.
3. Distillation: This method involves heating a liquid to create vapor and then cooling the vapor to produce a pure liquid. Metallic elements that are liquid at room temperature, like mercury, can be purified through distillation as the method relies on differences in boiling points to separate the metal from its impurities.
4. Zone Refining: This method is used to purify solids, particularly semiconductors, by moving a molten zone along a solid rod to separate impurities. It is not suitable for metals that are liquid at room temperature.

Given the properties of the methods and the requirements for purifying a metal that is liquid at room temperature, Distillation is the most suitable technique. This method effectively utilizes the separation of phases and differences in boiling points, making it ideal for purifying liquid metals like mercury.

Conclusion: The correct answer is Distillation, as it suitably purifies metals that are liquid at room temperature.