Why is the volume of hydrogen gas greater than the volume of oxygen gas during electrolysis of water?
Answer and explanation
Correct answer: Each water molecule contains two hydrogen atoms and one oxygen atom.
The formula of water is \(\mathrm{H_2O}\), so each water molecule contains two hydrogen atoms and one oxygen atom. The balanced electrolysis equation is \(2\mathrm{H_2O} \rightarrow 2\mathrm{H_2} + \mathrm{O_2}\). Therefore, under the same conditions, the volume of hydrogen produced is twice the volume of oxygen. Option A is incorrect because water does not contain equal numbers of hydrogen and oxygen atoms.
Frequently asked questions
What is the correct answer to this question?
Each water molecule contains two hydrogen atoms and one oxygen atom.
Why is this the correct answer?
The formula of water is \(\mathrm{H_2O}\), so each water molecule contains two hydrogen atoms and one oxygen atom. The balanced electrolysis equation is \(2\mathrm{H_2O} \rightarrow 2\mathrm{H_2} + \mathrm{O_2}\). Therefore, under the same conditions, the volume of hydrogen produced is twice the volume of oxygen. Option A is incorrect because water does not contain equal numbers of hydrogen and oxygen atoms.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
