Name the gas evolved [formula is not acceptable] – The gas that can be oxidized to sulphur.

Give the equation for:

(i) Heat on sulphur with conc. H₂SO₄

(ii) Reaction of - sugar with conc. H₂SO₄

Select from A, B, C –

A: Sodium hydroxide solution.

B: A weak acid.

C: Dilute sulphuric acid.

The solution which liberates sulphur dioxide gas, from sodium sulphite.

State your observation when – Sugar crystals are added to conc. sulphuric acid.