oxygen and its propertis

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 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

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

• Na₂O
• CO₂
• SO₂
• CaO

Which of following air pollutant gases causing "greenhouse" effect?

• SO₃
• NO₂
• CO
• CO₂

a metal + oxygen ----- >

• metal salt + hydrogen
• metal salt + oxygen
• metal oxide + oxygen
• metal oxide

copper + oxygen --- >

• copper oxide + oxygen
• copper oxide + hydrogen
• oxygen
• copper oxide

Is oxygen metal or nonmetal?

• metal
• nonmetal