Question

solution is used to check the prescenfe of oxygen​

Answer 1

Relighting a flickering splint of oxygen gas. Oxygen gas is formed by the decomposition of hydrogen peroxide that is squirted into a test tube containing manganese (IV) oxide, the decomposition catalyst. When the glowing splint is applied to the test tube, when it touches the oxygen, it explodes back into flame.

Answer 2

Answer:

Methylene Blue: Oxygen Indicator

Water containing the methylene blue indicator is blue when oxygen is present. A deep blue color can be achieved by capping a solution of water and methylene blue and shaking it vigorously to mix oxygen from the air into the water.