1. Which sequence correctly represents increasing molecular weight among hydrocarbons?
a) Methane, Ethane, Propane, Butane
b) Propane, Butane, Ethane, Methane
c) Butane, Ethane, Propane, Methane
d) Butane, Propane, Ethane, Methane
Answer: a

2. Which statements are correct regarding natural gas and LNG?

1. LNG is liquefied at very low temperatures and high pressure for storage.
2. India’s first LNG terminal was in Hassan.
3. Natural Gas Liquids (NGL) include ethane, propane, butane, and natural gasoline.
   a) Only 1
   b) 1 and 3
   c) 2 and 3
   d) 1, 2, and 3
   Answer: b

3. Identify the heterocyclic compound:
a) Benzene
b) Anthracene
c) Naphthalene
d) Furan
Answer: d

4. Most mine explosions are caused by a mixture of:
a) Hydrogen and oxygen
b) Oxygen and acetylene
c) Methane and air
d) Carbon dioxide and ethane
Answer: c

5. Which of the following statements about pyrolysis is incorrect?
a) It occurs above 430°C under high pressure.
b) It is thermochemical decomposition of organic waste.
c) It produces solid, liquid, and gas useful for energy.
d) It occurs at atmospheric pressure above 430°C.
Answer: d

6. Regarding coalbed methane and shale gas, which statements are correct?

1. Coalbed methane is pure methane from coal seams; shale gas is a mix of propane and butane.
2. India has coalbed methane reserves but no shale gas reserves yet.
   a) Only 1
   b) Only 2
   c) Both 1 and 2
   d) Neither 1 nor 2
   Answer: c

7. Synthetic ethanol is produced by reacting ethene with:
a) Hydrogen
b) Potassium dichromate
c) Oxygen
d) Steam
Answer: d

8. Gas used for artificial ripening of fruits:
a) Ethane
b) Acetylene
c) Propane
d) Methane
Answer: b

9. Primary component of natural gas:
a) Methane
b) Butane
c) Propene
d) Ethane
Answer: a

10. Which element is present in all organic compounds?
a) Carbon
b) Calcium
c) Nitrogen
d) Oxygen
Answer: a

11. Which petroleum product has the lowest boiling point?
a) Kerosene
b) Lubricating oil
c) Gasoline
d) Diesel
Answer: c

12. Hexachlorobenzene is also known as:
a) Pyrene
b) Artificial silk
c) Gammexane
d) Artificial camphor
Answer: c

13. The toxic alcohol causing blindness in illicit liquor is:
a) Ethyl alcohol
b) Amyl alcohol
c) Benzyl alcohol
d) Methyl alcohol
Answer: d

14. Gas found in marshy areas due to plant decay:
a) Carbon monoxide
b) Carbon dioxide
c) Sulphur dioxide
d) Methane
Answer: d

15. Natural rubber is a polymer of:
a) Isoprene
b) Styrene
c) Vinyl acetate
d) Propene
Answer: a

16. Assertion: Phenyl is used as a household disinfectant.
Reason: Phenyl is a derivative of phenol, which is a germicide.
Answer: a) Both A and R are true, and R explains A

17. Assertion: Methane is the main component of LPG.
Reason: Methane is directly supplied via pipelines for domestic use.
Answer: d) A is false, R is true

18. Active component in clove oil:
a) Menthol
b) Eugenol
c) Benzaldehyde
d) Methanol
Answer: b

19. Product formed when chlorine reacts with ethylene:
a) Ethylidene chloride
b) Ethyl chloride
c) Ethylene chlorohydrin
d) Ethylene chloride
Answer: d

20. Which carbon allotrope is used in cutting and drilling tools?
a) Diamond
b) Graphite
c) Activated charcoal
d) Carbon black
Answer: a

21. Typical hydrocarbon chain length in kerosene:
a) C1–C4
b) C5–C7
c) C6–C11
d) C10–C16
Answer: d

22. Assertion: Cold storage plants use ammonia as a refrigerant while homes use CFCs.
Reason: Ammonia liquefies at ambient temperature and low pressure.
Answer: a) Both A and R are true, and R explains A

23. In which molecule is the distance between adjacent carbon atoms greatest?
a) Benzene
b) Ethane
c) Ethene
d) Ethyne
Answer: b

24. First organic compound synthesized in a lab:
a) Urea
b) Uric acid
c) Lactic acid
d) Glucose
Answer: a

25. Chlorofluorocarbons (CFCs) are used in:

1. Plastic foams
2. Tubeless tyres
3. Cleaning electronics
4. Aerosol sprays
   Correct answer: c) 1, 3, and 4 only

26. Nitrogen content in ammonium sulphate is approximately:
a) 18%
b) 21%
c) 25%
d) 30.5%
Answer: b

27. Widely used application of chlorofluorocarbons:
a) Microwave ovens
b) Solar heaters
c) Washing machines
d) Refrigerators
Answer: d

28. Match the fuel gases with their major components:

• A. CNG – 3. Butane, Ethane
• B. Coal gas – 4. Hydrogen, Methane, CO
• C. LPG – 2. Butane, Propane
• D. Water gas – 1. Carbon monoxide, Hydrogen
  Answer: b) A–3, B–4, C–2, D–1