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Questions and Answers

What are some fuels used in trade and industry?

  • Diesel and compressed natural gas (CNG)
  • Cowdung and wood
  • Charcoal and petrol
  • Coal and compressed natural gas (CNG) (correct)

What is combustion?

  • A process in which a substance reacts with nitrogen to give off heat
  • A process in which a substance reacts with carbon dioxide to give off heat
  • A process in which a substance reacts with water to give off heat
  • A chemical process in which a substance reacts with oxygen to give off heat (correct)

What is combustion?

  • A process in which a substance reacts with water to give off heat
  • A process in which a substance reacts with carbon dioxide to give off heat
  • A process in which a substance reacts with nitrogen to give off heat
  • A chemical process in which a substance reacts with oxygen to give off heat (correct)

What is the difference between the burning of a candle and the burning of a fuel like coal?

<p>Candle burns with a flame whereas coal does not (D)</p> Signup and view all the answers

What is food considered as in the context of the text?

<p>A fuel for our body (D)</p> Signup and view all the answers

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