Question

Choose the correct answer.

The ratio of the volume of hydrogen to oxygen obtained during the electrolysis of water is ___________.

• A. 1: 2
• B. 2:1
• C. 3:2
• D. 2:3

Answer 1

The correct option is B

2:1

Electrolysis

• If the decomposition of a substance takes place by the passage of electricity, it is called electrolysis or electrolytic decomposition reaction.
• It is a type of decomposition reaction.

Electrolysis of water-

• Electrolysis of water is the process of using electricity to decompose water into oxygen and hydrogen gas by a process called electrolysis.
• Hydrogen gas released in this way can be used as hydrogen fuel or remixed with oxygen to create oxyhydrogen gas, which is used in welding and other applications.

The chemical equation for electrolysis of water-

$$\begin{gathered} 2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to 2{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right) \\ \mathrm{water}\mathrm{hydrogen}\mathrm{oxygen} \end{gathered}$$

The ratio of the volume of hydrogen to oxygen obtained during the electrolysis of water is 2: 1

Therefore option (b) 2:1 is the correct answer.