Question : The chemical formula of propene is:

Option 1: C₂H₄

Option 2: C₃H₄

Option 3: C₂H₂

Option 4: C₃H₆

Question : What is the percentage composition of the element of H₂SO₃?

Option 1: 2.5% of H, 58.5% of S, 39% of O

Option 2: 33% of H, 16% of S, 51% of O

Option 3: 58.5% of H, 39% of S, 2.5% of O

Option 4: 2.5% of H, 39% of S, 58.5% of O

Question : Aerated water contains

Option 1: SO₂

Option 2: NO₂

Option 3: H₂

Option 4: CO₂

Question : What is the product formed when CH₃CH₂OH reacts with O₂?

Option 1: H₂O+ heat

Option 2: CO₂ + H₂O + heat and light

Option 3: CO₂ + H₂O

Option 4: CO₂ + heat and light

Question : The chemical formula of gypsum is ______.

Option 1: CaSO₄.2H₂O

Option 2: CaSO₄.H₂O

Option 3: CaSO₄

Option 4: CaSO₄.(1/2)H₂O