In the electrolysis of water, if the volume of oxygen produced is 15 mL, what will be the volume of hydrogen produced under the same conditions?
Answer and explanation
Correct answer: 30 mL
The electrolysis equation is 2H₂O → 2H₂ + O₂. It shows that hydrogen and oxygen are produced in a volume ratio of 2:1, provided temperature and pressure are the same. Therefore, for 15 mL of oxygen, hydrogen volume = 2 × 15 = 30 mL. Option A is half the oxygen volume, while B ignores the ratio and D uses an incorrect factor of three.
Frequently asked questions
What is the correct answer to this question?
30 mL
Why is this the correct answer?
The electrolysis equation is 2H₂O → 2H₂ + O₂. It shows that hydrogen and oxygen are produced in a volume ratio of 2:1, provided temperature and pressure are the same. Therefore, for 15 mL of oxygen, hydrogen volume = 2 × 15 = 30 mL. Option A is half the oxygen volume, while B ignores the ratio and D uses an incorrect factor of three.
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.
