Question

what happens when sulphur burns in the presence of oxygen? How will you show that the compound formed in this reaction in acidic in nature?

Answer 1

When sulphur is burnt in the presence of oxygen hydrogen gas is released. To show that the compound formed in this reaction is whether acidic or base we have to use universal indicator I.e litmus paper.

Answer 2

Heyy there!!

What happens when sulphur burns in air?
When 99.5% pure Louisiana Sulphur burns in air (reacting with the oxygen), sulphur dioxide gas is formed.

Reaction:
S + O₂ ------> SO₂
Sulphur dioxide is an acidic oxide. How to prove it?

Note: Acidic oxides, also called acid anhydrides, when react with water, form their respective acids, which turns moist blue litmus paper red.

So, just react sulphur dioxide with water.
Reaction:
SO₂ + H₂O -----> H₂SO₃
Sulphurous acid is formed. Pour it on moist litmus paper, it turns red, which shows acidic properties.

Tests for SO₂:
SO₂ gas, like carbon dioxide, turns lime water milky.
SO₂ gas turns bromine solution colourless (from brown).
SO₂ gas turns alkaline KMnO₄ solution colourless (from pink).
SO₂ gas turns acidified K₂Cr₂O₇ solution green (from orange).



HOPE MY ANSWER IS SATISFACTORY....
THANKS!!