Question

Calcium starts to float when it is immersed in water.

• A. True
• B. False

Answer 1

The correct option is A True

Metal reacts with water to form metal hydroxide and hydrogen gas. So calcium reacts with water to form calcium hydroxide and hydrogen gas. The bubbles of the hydrogen gas stick to the surface of the calcium metal and makes it float. The reaction takes place as follows:

$\text{Ca(s)}+2{\text{H}}_2\text{O(l)}\to {\text{Ca(OH)}}_2\text{(aq)}+{\text{H}}_2\text{(g)}$