Properties of Carbon Compounds Combustion Oxidation - UNSOLVED PRACTICE SET
Chapter: Carbon and Its Compounds | Topic: Properties of Carbon Compounds Combustion Oxidation
PROPERTIES OF CARBON COMPOUNDS COMBUSTION OXIDATION - UNSOLVED PRACTICE SET
Topic: Properties of Carbon Compounds Combustion Oxidation
Multiple Choice Questions
Q1. Which of the following is a product of complete combustion of a hydrocarbon?
- Carbon monoxide and water
- Carbon and hydrogen
- Carbon dioxide and water
- Carbon dioxide and hydrogen
Q2. Incomplete combustion of methane produces:
- COβ and HβO
- CO and HβO
- C and HβO
- COβ and Hβ
Q3. Oxidation of ethanol in the presence of acidified potassium dichromate produces:
- Ethane
- Ethene
- Ethanoic acid
- Ethanol
Q4. Which of the following burns with a sooty flame?
- Methane
- Ethane
- Ethene
- All of the above equally
Q5. The blue flame of a Bunsen burner indicates:
- Incomplete combustion
- No combustion
- Complete combustion
- Presence of impurities
Q6. Oxidation of a substance involves:
- Gain of hydrogen
- Loss of oxygen
- Gain of oxygen or loss of hydrogen
- Gain of electrons
Short Answer Questions
Q7. Write the balanced chemical equation for the complete combustion of propane (CβHβ).
Q8. Why does a candle burn with a yellow flame in a limited supply of air, but with a blue flame when the air supply is good?
Q9. What is the difference between combustion and oxidation? Give one example of each.
Q10. Why is it dangerous to burn coal or wood in a closed room? What poisonous gas is produced?
Q11. Your grandmother uses a traditional chulha (stove) in the village. Sometimes the flame is yellow and smoky. Explain why this happens and how she can get a cleaner, blue flame.
Q12. Write the chemical equation for the oxidation of ethanol to ethanoic acid. Name the oxidizing agent used.
Long Answer Questions
Q13. Explain the process of combustion with reference to carbon compounds. Distinguish between complete combustion and incomplete combustion. Write balanced chemical equations for the complete and incomplete combustion of methane.
Q14. Describe an experiment to demonstrate the oxidation of ethanol to ethanoic acid using acidified potassium dichromate solution. What colour change would you observe? Write the chemical equation for the reaction. Why is this reaction called an oxidation reaction?
Q15. During Diwali, your family burns sparklers and candles. You notice that some sparklers burn with a bright white flame, while a candle burns with a yellow flame.
(a) What determines the colour of the flame during combustion?
(b) Why does a candle produce soot when the wick is too long?
(c) Write the chemical equation for the complete combustion of the wax (approximate formula Cββ Hβ β).
(d) Why is complete combustion preferred over incomplete combustion for heating purposes?
Numerical / Application-Based Problems
Q16. Methane (CHβ) burns in oxygen according to the equation:
CHβ + 2Oβ β COβ + 2HβO
(a) Calculate the volume of oxygen required to burn 5 litres of methane completely.
(b) Calculate the volume of carbon dioxide produced.
(c) If the methane is burned in insufficient oxygen, what other product may form?
Q17. A hydrocarbon CβHᡧ undergoes complete combustion to produce 44 g of COβ and 27 g of HβO.
(a) Calculate the mass of carbon in 44 g of COβ. (Atomic mass: C = 12, O = 16)
(b) Calculate the mass of hydrogen in 27 g of HβO. (Atomic mass: H = 1, O = 16)
(c) Find the simplest whole number ratio of carbon to hydrogen atoms and determine the empirical formula of the hydrocarbon.
Q18. In a chemistry experiment, 4.6 g of ethanol is completely burned in air.
(a) Write the balanced chemical equation for the combustion of ethanol (CβHβ OH).
(b) Calculate the mass of carbon dioxide produced. (Atomic masses: C = 12, H = 1, O = 16)
(c) Why is ethanol considered a cleaner fuel compared to petrol?