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Consider the following statements regarding Compressed natural gas (CNG).
  1. CNG is comprised mostly of methane gas.
  2. CNG engines run more quietly due to very low octane rating of CNG over gasoline.
  3. CNG vehicles reduce Harmful emissions such as carbon monoxide (CO), carbon dioxide (CO2) and nitrous oxide (N2O) by more than 90% when compared to gasoline powered vehicles.
How many of the above statements are correct?
  • a)
    Only one 
  • b)
    Only two 
  • c)
    All three 
  • d)
    None
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Consider the following statements regarding Compressed natural gas (CN...
Statement 2 is incorrect.
Compressed natural gas, or CNG, is natural gas under pressure which remains clear, odourless, and non-corrosive – and can be used as a cheaper, greener, and more efficient alternative to the traditional petrol and diesel fuels for vehicles.
CNG is comprised mostly of methane gas which, like gasoline, produces engine power when mixed with air and fed into your engine’s combustion chamber.
CNG engines run more quietly due to the higher-octane rating of CNG over gasoline and they produce less exhaust emissions. Harmful emissions such as carbon monoxide (CO), carbon dioxide (CO2) and nitrous oxide (N2O) can be reduced by as much as 95% when compared to gasoline powered vehicles.
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Community Answer
Consider the following statements regarding Compressed natural gas (CN...
Correct statement regarding Compressed natural gas (CNG):

Methane composition:
- CNG is comprised mostly of methane gas, making it a cleaner alternative fuel compared to gasoline.

Noise level:
- CNG engines run more quietly due to the very low octane rating of CNG compared to gasoline.

Reduced harmful emissions:
- CNG vehicles reduce harmful emissions such as carbon monoxide (CO), carbon dioxide (CO2), and nitrous oxide (N2O) by more than 90% when compared to gasoline-powered vehicles.
Therefore, only the second and third statements are correct, making option 'B' the correct choice.
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Consider the following statements regarding Compressed natural gas (CNG). CNG is comprised mostly of methane gas. CNG engines run more quietly due to very low octane rating of CNG over gasoline. CNG vehicles reduce Harmful emissions such as carbon monoxide (CO), carbon dioxide (CO2) and nitrous oxide (N2O) by more than 90% when compared to gasoline powered vehicles.How many of the above statements are correct?a)Only oneb)Only twoc)All threed)NoneCorrect answer is option 'B'. Can you explain this answer?
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