Oxygen and Its Compounds

Chemistry ⇒ Chemistry of Non-metals and Their Compounds

Oxygen and Its Compounds starts at 8 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Oxygen and Its Compounds. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 10

A sample of air contains 21% oxygen by volume. Calculate the number of oxygen molecules present in 5 L of air at STP. (1 mole of gas at STP = 22.4 L, Avogadro's number = 6.022 × 10²³ molecules/mol)

Describe the laboratory preparation of oxygen gas using potassium chlorate (KClO₃) and manganese dioxide (MnO₂) as a catalyst. Write the balanced chemical equation and explain the role of the catalyst. If 12.25 g of KClO₃ is used, calculate the mass of oxygen gas produced. (Molar mass of KClO₃ = 122.5 g/mol, O₂ = 32 g/mol)

Explain the difference between the molecular structures of dioxygen (O₂) and ozone (O₃). How does this structural difference influence their chemical properties and uses?

Hydrogen peroxide (H₂O₂) decomposes to form water and oxygen gas. Write the balanced chemical equation for this reaction. If 6.8 g of hydrogen peroxide decomposes completely, calculate the volume of oxygen gas produced at STP. (Molar mass of H₂O₂ = 34 g/mol, 1 mole of gas at STP = 22.4 L)

Ozone (O₃) is an allotrope of oxygen and acts as a powerful oxidizing agent. Write a balanced chemical equation for the reaction of ozone with potassium iodide (KI) in acidic medium. Explain the role of ozone in this reaction and calculate the number of moles of iodine (I₂) liberated when 0.1 mole of ozone reacts completely.

Compare and contrast the physical and chemical properties of oxygen and hydrogen peroxide (H₂O₂).

Describe the environmental significance of the ozone layer and the consequences of its depletion.

Describe the role of oxygen in respiration and explain why it is essential for most living organisms.

Describe the steps involved in the purification of water using ozone.

Discuss the industrial uses of oxygen and its compounds.

Discuss the properties of water (H₂O) that make it a unique compound of oxygen.

Explain how oxides are classified and give examples of acidic, basic, and amphoteric oxides of oxygen.

Explain the difference between ozone (O₃) and dioxygen (O₂) in terms of their structure and importance.

Explain the process of rusting of iron and the role of oxygen in this process.

Write a short note on the laboratory preparation of oxygen gas, mentioning the chemical reaction involved.