BITSAT2017ChemistrySome Basic Concepts of ChemistryActual
On electrolysis of water, a total of 1 mole of gases is evolved. The amount of water decomposed is
Options
- A1   mol
- B2   mol
- C1 3   mol
- D2 3   mol
Correct answer
D. 2 3   mol
Step-by-step solution
∵ Only one mole of total gases are evolved and H 2 O decomposes as H 2 O → decomposition H 2 + 1 2 O 2 i.e. total moles = 1 + 1 2 = 3 2 moles by one mole of H 2 O Now, ∵   3 2 moles of gases are evolved by = 1   mole of H 2 O ∴   1   mole of gases are evolved by = 1 3 / 2 = 2 3 Hence, 1   mole of total gases are evolved by 2 3   mole of H 2 O .