Question

Name an element which reacts violently with water at room temperature.

• A. Sodium
• B. Chlorine
• C. Aluminium
• D. None of these

Answer 1

The correct option is A Sodium

• Two metals, named Sodium and Potassium, react vigorously with water at room temperature.
  
• Sodium is a very high reactive metal. when is it kept in open sodium reacts with oxygen in the air at room temperature, to form, sodium oxide. Therefore it catches fire and starts burning when kept in open in the air. Hence sodium is kept under kerosene to prevent its reaction with oxygen, moisture and carbon dioxide.
  
• Hence, option A is the correct answer.