The role of sulphuric acid in the reaction given below is :

S + 2H₂SO₄ ⟶ 3SO₂ + 2H₂O

1. Non volatile acid
2. Oxidising agent
3. Dehydrating agent
4. None of the above

Dilute H₂SO₄ and conc. H₂SO₄ can be distinguished by :

1. Copper
2. Silver
3. Gold
4. Platinum

The acid which produces charcoal from sugar is :

1. conc. HNO₃
2. conc. HCl
3. Conc. H₂SO₄
4. conc. H₃PO₄

The substance which can be used as drying as well as dehydrating agent is :

1. conc. H₂SO₄
2. conc. HNO₃
3. Conc. HCl
4. conc. H₂CO₃