Question

When an element ‘X’ reacts with water, it starts floating. Identify the element ‘X’:

विकल्प

• Potassium

• Calcium

• Sodium

• Iron

Answer 1

Calcium

Explanation:

Calcium reacts less violently with water. The reaction produces hydrogen gas. The bubbles of H₂ gas stick to the surface of the metal pieces, making them buoyant and causing the metal to float.