Quiz  /  Hydrocarbons Class 10 MCQ Questions With Answers

  • 1. 
    What process is used to separate crude oil in hydrocarbons with different chain lengths?

  • distillation
  • fractional distillation
  • cracking
  • polymerisation

  • 2. 
    At which pipe: M or N are hydrocarbons with lower boiling points collected?

  • M
  • N

  • 3. 
    Molecules collected at the bottom of the fractionating column tend to be...

  • more viscous, less flammable and less volatile
  • less viscous, more flammable and more volatile
  • more viscous, more flammable and less volatile
  • less viscous, less flammable and more volatile

  • 4. 
    Fractional distillation separates crude oil based on the different __________ of the molecules in the mixture

  • melting point
  • boiling point
  • freezing point
  • chemical reactivity

  • 5. 
    What conditions are needed for cracking?

  • high temperature
  • high pressure
  • catalyst
  • Both A & B

  • 6. 
    How many carbon atoms are in ethane?

  • 1
  • 2
  • 3
  • 4

  • 7. 
    When testing for alkenes (unsaturation) bromine water turns from...

  • orange --> blue/black
  • colourless --> pink
  • orange --> colourless
  • orange --> clear

  • 8. 
    In complete combustion, the products are?

  • Carbon monoxide and water
  • Carbon dioxide and water
  • Carbon dioxide and carbon
  • Carbon and water

  • 9. 
    Which of the following will react with Br2(l)

  • hexene
  • cyclohexane
  • hexane
  • alkanes

  • 10. 
    What is the term given to the process by which longer chain hydrocarbons are broken down into shorter length alkanes and alkenes?

  • fractional distillation
  • evaporation
  • cracking
  • polymerisation

  • 11. 
    Where in the fractionating column are shorter chain hydrocarbon molecules obtained?

  • At the top
  • At the bottom

  • 12. 
    How many carbon atoms are in methane?

  • 1
  • 2
  • 3
  • 4

  • 13. 
    When the ring on a Bunsen burner is closed during a combustion reaction , soot forms. Soot is?

  • carbon dioxide
  • carbon
  • carbon monoxide
  • burnt propane

  • 14. 
    What does a fuel react with when it burns?

  • oxygen
  • water
  • carbon dioxide
  • methane

  • 15. 
    What is the general formula of the alkenes?

  • CnH2n+1
  • CnH2n+2
  • CnH2n
  • CnH2n+1OH

  • 16. 
    What are the products of incomplete combustion?

  • carbon monoxide and carbon
  • carbon monoxide and water
  • carbon monoxide and hydrogen
  • None of these

  • 17. 
    Which of the following would have the highest boiling point?

  • C3H8
  • C4H8
  • C5H12
  • C22H44

  • 18. 
    Limewater turning cloudy is the test for...

  • carbon dioxide
  • water
  • hydrogen
  • oxygen
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