Question

Calcium reacts with water to form calcium hydroxide and hydrogen gas.

• A. True
• B. False

Answer 1

The correct option is A

True

A metal reacts with water to give metal hydroxide and hydrogen gas. The reaction is given below.

$Ca\left(g\right)+2H_{2}O\left(l\right)\to Ca\left(OH{)}_2\right(aq)+H_2\uparrow$

In this case, calcium reacts less vigorously with water to form calcium hydroxide and hydrogen gas.

After the reaction is complete we observe that the metal floats in water because of the hydrogen gas which sticks to the surface of the metal.