Which substance supports burning?

• Hydrogen
• Nitrogen
• Oxygen
• Carbon Dioxide

What is the percentage existence of oxygen gas in air?

• %78
• %32
• %18
• %21

Which of the following method is one of the laboratory preparation of oxygen gas?

• Decomposition of KClO₃
• Decomposition of H₂S
• Combination of H and O
• Distillation of H₂O

Which of the following is not an use of oxygen? 

• For cutting metals
• In hospitals
• As fuel for cars
• For respiration

What is the test for Oxygen gas?

• Litmus paper
• Glowing splint
• "Pop" sound
• Red flame

Which of the following oxide is different than the others?

• SO₃
• CO₂
• CaO
• P₂O₅

Which of the following oxide is the one of the neutral oxide?

• Al₂O₃
• NO₂
• Na₂O
• H₂O

When carbon dioxide reacts with water which of the following acid is formed?

• H₂CO₃
• HCl
• HNO₃
• H₂SO₃

Which oxide is used to reduce acidity of soil in agriculture?

• Na₂O
• CO₂
• SO₂
• CaO

Which layer of air allows all living and nonliving activities to occur in?

• Thermosphere
• Troposphere
• Mezosphere
• Stratosphere