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State whether the following statements are true or false:

(a) CNG is more polluting than petrol.
(b) Kerosene is not a fossil fuel.
(c) Combustion can take place in the absence of air.
(d) Rhizobium bacteria fix atmospheric carbon dioxide.
(e) Coal is called black gold because of its great commercial use.



Answer :

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Final answer:

The response provides explanations for the true or false statements regarding CNG, kerosene, combustion, Rhizobium bacteria, and coal's commercial value.


Explanation:

True or False:

  1. (a) False: Natural gas (CNG) is less polluting than petrol as it emits less carbon dioxide, nitrogen oxides, and sulfur dioxide when burned.
  2. (b) False: Kerosene is indeed a fossil fuel derived from petroleum.
  3. (c) False: Combustion requires air as it is a chemical reaction that involves the rapid oxidation of a material.
  4. (d) False: Rhizobium bacteria fix atmospheric nitrogen, not carbon dioxide.
  5. (e) True: Coal is referred to as 'black gold' due to its significant commercial value and widespread use.

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