Which of the following metal is kept immersed in kerosene? 

Sodium 

The correct answer is option 2. Sodium.

The metal that is kept immersed in kerosene to prevent it from reacting with oxygen and moisture in the air is sodium.

Sodium is a highly reactive metal that reacts vigorously with oxygen and moisture in the air, leading to the formation of sodium oxide and sodium hydroxide, which are powdery and hydrated respectively. Immersing sodium in kerosene helps to create a protective layer of kerosene around the metal, preventing it from coming into contact with air and moisture. This helps to prevent the metal from reacting and undergoing rapid oxidation. So, the correct answer is: Sodium