Multiple choice

Which one of the following gases contains the maximum % of carbon monoxide?

  1. Coal gas

  2. Natural gas

  3. Producer gas

  4. Water gas
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A Correct answer
Explanation

Coal gas contains the highest percentage of carbon monoxide (about 25-35%) among the options. Producer gas and water gas also contain CO but in different proportions. Natural gas is primarily methane and contains minimal carbon monoxide.

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