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

Choose the correct answer from the choices:

The gas evolved when dil. sulphuric acid reacts with iron sulphide.

A: Hydrogen sulphide
B: Sulphur dioxide
C: Sulphur trioxide
D: Vapour of sulphuric acid.

Give balanced equations for the manufacture of sulphuric acid by the Contact process.

State the property of sulphuric acid shown by the reaction of conc. sulphuric acid when heated with

(a) Potassium nitrate

(b) Carbon