Multiple choice

Oxygen is prepared on a large scale from

  1. water

  2. calcium carbonate

  3. potassium permanganate

  4. sodium peroxide

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

On a large industrial scale, oxygen is primarily obtained through the fractional distillation of liquid air, but among the choices, water electrolysis is the standard method for producing high-purity oxygen.