1. Hydrocarbons are compounds containing
Answer: C. carbon and hydrogen only
Chemistry Class 10 Unit 9: Hydrocarbons MCQs
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2. Hydrocarbons whose carbon-carbon bonds are all single bonds are called
Answer: D. saturated hydrocarbons
3. Hydrocarbons containing carbon-carbon multiple bonds are called
Answer: A. unsaturated hydrocarbons
4. Which of the following is an unsaturated hydrocarbon?
Answer: B. CH₃CH=CH₂
5. The type of bond present between the carbon atoms in alkynes is
Answer: D. triple covalent bond
6. Alkenes can be prepared industrially by the
Answer: B. cracking of large alkane molecules
7. Cracking is the breaking of
Answer: C. large alkane molecules into smaller hydrocarbons
8. Cracking of large alkane molecules requires
Answer: A. high temperature and a catalyst
9. Which of the following is a product of cracking large alkane molecules?
Answer: D. Alkenes
10. Cracking is important because it produces smaller hydrocarbons that are
Answer: A. more volatile and better fuels
11. When decane (C₁₀H₂₂) is cracked, it can give octane and
Answer: C. ethene
12. Dehydration of an alcohol means
Answer: B. loss of water
13. Dehydration of ethanol gives
Answer: C. ethene
14. Dehydration of alcohols is an example of an
Answer: A. elimination reaction
15. Dehydrohalogenation means loss of
Answer: D. hydrogen halide
16. Halogenoalkanes on heating with alcoholic KOH give
Answer: B. alkenes
17. Ripening fruits and vegetables give off
Answer: B. ethene
18. When bromine water is added to an alkene, the reddish-brown colour
Answer: C. disappears
19. The reaction of ethene with bromine gives
Answer: D. 1,2-dibromoethane
20. The test used to distinguish saturated from unsaturated hydrocarbons is the
Answer: A. bromine water test
21. Saturated hydrocarbons (alkanes) with bromine water
Answer: D. do not react; the solution stays orange-brown
22. Baeyer's test uses
Answer: B. cold dilute alkaline aqueous KMnO₄
23. The reaction of ethene with KMnO₄ gives
Answer: C. ethylene glycol
24. Which compound will discharge the pink colour of KMnO₄ solution and be oxidised?
Answer: A. Ethene
25. The addition of hydrogen to an alkene is called
Answer: D. hydrogenation
26. Hydrogenation of alkenes takes place in the presence of finely divided
Answer: A. nickel catalyst at 200–300 °C
27. Hydration of an alkene is addition of
Answer: C. steam (water)
28. Hydration of ethene with steam using phosphoric acid catalyst gives
Answer: B. ethanol
29. Alkynes are hydrocarbons with at least one
Answer: D. triple bond between carbon atoms
30. Ethyne is commonly used for
Answer: A. welding and cutting metals
31. The oxy-acetylene flame has a temperature of about
Answer: B. 3200 °C
32. Ethyne gas for ripening fruits is produced when ______ comes in contact with moisture.
Answer: C. calcium carbide
33. Fossil fuels include
Answer: A. coal, natural gas and petroleum
34. Fossil fuels are
Answer: D. non-renewable energy sources
35. The main constituent of natural gas is
Answer: C. methane
36. Crude oil is separated into fractions by
Answer: B. fractional distillation
37. Fractional distillation of petroleum separates fractions on the basis of
Answer: C. boiling point
38. From bottom to top of the fractionating column, the chain length
Answer: D. decreases
39. From bottom to top of the column, the volatility
Answer: A. increases
40. Which property increases from the bottom to the top of the fractionating column?
Answer: B. Volatility
41. The fraction with the shortest chain, lowest boiling point and highest volatility is
Answer: C. refinery gas (LPG)
42. The fraction with the longest chain, highest boiling point and highest viscosity is
Answer: A. bitumen
43. Refinery gas (LPG) contains molecules with
Answer: D. 1 to 4 carbon atoms
44. The refinery gas fraction is used as
Answer: B. cylinder gas for cooking and heating
45. The petrol (gasoline) fraction is mainly used as
Answer: A. fuel for cars
46. The naphtha fraction is mainly used as
Answer: C. chemical feedstock
47. The kerosene fraction is used as
Answer: D. jet fuel
48. The diesel fraction is used as fuel for
Answer: B. diesel engines of buses, trucks and trains
49. The fuel oil fraction is used for
Answer: A. ships, power stations and home heating
50. The lubricating oil fraction is used for
Answer: D. lubricants, waxes and polishes
About Chemistry Class 10 Unit 9 MCQs (Federal Board)
These 52 Chemistry MCQs cover Class 10 Unit 9: Hydrocarbons of the Federal Board (FBISE) SSC-II (Class 10) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 2 pages of 50. You can also read the Hydrocarbons notes for this chapter. Download the Hydrocarbons MCQs as a PDF using the button at the top of this page.