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Q: ……… is a pure substance?
  • A. Sugar solution
  • B. Methane
  • C. Milk
  • D. Air
Correct Answer: Option B - Methane is a pure substance. It is found in the form of natural gas along with petroleum substances under the surface of the earth, It is also found in marsh lands, hence it is also called marsh gas.
B. Methane is a pure substance. It is found in the form of natural gas along with petroleum substances under the surface of the earth, It is also found in marsh lands, hence it is also called marsh gas.

Explanations:

Methane is a pure substance. It is found in the form of natural gas along with petroleum substances under the surface of the earth, It is also found in marsh lands, hence it is also called marsh gas.