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Q: Which of the following two gases are the main part of the Earth’s atmosphere?
  • A. Oxygen and carbon monoxide
  • B. Nitrogen and hydrogen
  • C. Nitrogen and oxygen
  • D. Carbon dioxide and nitrogen
Correct Answer: Option C - The cover of gases spread around the earth is called atmosphere. It is the homogeneous mixture of gases and is held together by the Earth's gravitational force. Among the many gases present in the atmosphere, nitrogen and oxygen gases are prominent and in highest quantity. The composition of various gases in the atmosphere is as follows- Nitrogen–78.08%, Oxygen–20.95%, Argon–0.93%, Carbon Dioxide–0.003%. Apart from this there are several gases like Neon, Helium, Krypton, Xenon, Hydrogen, Methane, Ozone etc.
C. The cover of gases spread around the earth is called atmosphere. It is the homogeneous mixture of gases and is held together by the Earth's gravitational force. Among the many gases present in the atmosphere, nitrogen and oxygen gases are prominent and in highest quantity. The composition of various gases in the atmosphere is as follows- Nitrogen–78.08%, Oxygen–20.95%, Argon–0.93%, Carbon Dioxide–0.003%. Apart from this there are several gases like Neon, Helium, Krypton, Xenon, Hydrogen, Methane, Ozone etc.

Explanations:

The cover of gases spread around the earth is called atmosphere. It is the homogeneous mixture of gases and is held together by the Earth's gravitational force. Among the many gases present in the atmosphere, nitrogen and oxygen gases are prominent and in highest quantity. The composition of various gases in the atmosphere is as follows- Nitrogen–78.08%, Oxygen–20.95%, Argon–0.93%, Carbon Dioxide–0.003%. Apart from this there are several gases like Neon, Helium, Krypton, Xenon, Hydrogen, Methane, Ozone etc.