Question

What is the observation that can be made when calcium reacts with $H_{2}O$?

• A. Vigorous reaction
• B. Calcium floats on water
• C. Calcium does not react at all
• D. Explosive reaction

Answer 1

The correct option is B

Calcium floats on water

Calcium reacts less vigorously with water to form hydrogen gas. The metal starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal.