Which one of the following elements will remain as liquid inside pure boiling water?
(1) Li   (2) Ga   (3) Cs   (4) Br


Answer: Option 2
Explanation:

1. Li (Lithium): Lithium has a melting point of about 180.5 degrees Celsius, which is well above the boiling point of water. So, if you place Li in boiling water, it would not remain in its liquid state.

2. Ga (Gallium): Gallium has a melting point of approximately 29.7 degrees Celsius, which is below the boiling point of water (100 degrees Celsius). It means that gallium will be in its liquid state at room temperature and would remain liquid even when placed in boiling water.

3. Cs (Cesium): Cesium has a melting point of about 28.4 degrees Celsius, which is also below the boiling point of water. However, cesium is highly reactive and reacts vigorously with water, so it would not remain as a liquid inside boiling water due to the reaction.

4. Br (Bromine): Bromine is a liquid element at room temperature and has a boiling point of about 58.8 degrees Celsius. It would readily vaporize when exposed to boiling water and would not remain in its liquid state.

Hence only Gallium (Ga) would remain in its liquid state inside boiling water.

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