Question

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

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

Answer 1

The Correct Option is D

To determine the method suitable for obtaining a highly pure metal that is liquid at room temperature, we need to evaluate the provided methods:

1. Zone Refining:

   This method is used to purify metals by moving a molten zone through a bar of impure metal. The method relies on the difference in solubility of impurities in solid and molten metal. However, zone refining is generally used for solid metals and not suitable for metals that are liquid at room temperature.

2. Electrolysis:

   Electrolysis involves the decomposition of a compound by passing an electric current through it. This is an effective method for purifying metals, particularly those in the solid state, but is not typically used to purify metals that are in a liquid state at room temperature.

3. Chromatography:

   This is a technique used to separate and analyze compounds that can be vaporized without decomposition. While it is excellent for separation and identification in mixtures, chromatography is not generally used to purify metals.

4. Distillation:

   Distillation involves heating a liquid to create vapor which is then condensed back into a liquid form to achieve purification or separation. This method is especially suitable for purifying mercury (a metal that is liquid at room temperature). Mercury can be heated and then the resulting vapor can be condensed to yield a pure metal.

   Therefore, distillation is the most appropriate method for obtaining a highly pure metal that is liquid at room temperature, such as mercury.

Conclusion: The correct method for obtaining a highly pure metal that is liquid at room temperature is Distillation. This method effectively exploits the physical property of boiling to separate impurities from the pure metal, particularly useful in the case of metals like mercury.