Oleum (H₂S₂O₇) when diluted by water it gives

An organic acid which on dehydration releases both CO and CO₂ gas is

Catalyst used for conversion of sulphur dioxide to sulphur trioxides is

When dilute sulphuric acid reacts with iron sulphide, the gas evolved is

Cane sugar reacts with con H₂SO₄ to give

Corrosive action of H₂SO₄ on skin is due to its

Con. H₂SO₄ acts as

Sulphur trioxide forms fuming sulphuric acid which is also called

Passing hydrogen sulphide in H₂SO₄ precipitates

H₂SO₄ react with skin cause blisters is due to