In electrolysis of water, if hydrogen is thirty-six millilitres, what will be the expected volume of oxygen?
Answer and explanation
Correct answer: Eighteen millilitres
The balanced decomposition equation is 2H₂O → 2H₂ + O₂. Under the same conditions of temperature and pressure, gas volumes follow the coefficient ratio, so hydrogen : oxygen = 2 : 1. If hydrogen occupies 36 mL, oxygen occupies 36 ÷ 2 = 18 mL. Thus option A is correct; 36 mL ignores the ratio, 72 mL reverses it, and 12 mL uses an incorrect factor.
Frequently asked questions
What is the correct answer to this question?
Eighteen millilitres
Why is this the correct answer?
The balanced decomposition equation is 2H₂O → 2H₂ + O₂. Under the same conditions of temperature and pressure, gas volumes follow the coefficient ratio, so hydrogen : oxygen = 2 : 1. If hydrogen occupies 36 mL, oxygen occupies 36 ÷ 2 = 18 mL. Thus option A is correct; 36 mL ignores the ratio, 72 mL reverses it, and 12 mL uses an incorrect factor.
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.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
