Question

A molecule of water

(a) cannot be broken down
(b) can be broken down by hammering it
(c) can be broken down by boiling the water
(d) can be broken down by passing an electric current through water.

Answer 1

(d) can be broken down by passing an electric current through water
A molecule of water is formed by 2 atoms of hydrogen and 1 atom of oxygen. Thus, it can be split into hydrogen and oxygen by passing an electric current through it. This process is called the electrolysis of water.