Question

Which of the following represents the correct composition of air by volume?

• A. Nitrogen - 21%, oxygen - 78% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.
• B. Nitrogen - 60%, oxygen - 38% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.
• C. Nitrogen - 21%, oxygen - 78% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.
• D. ​Nitrogen - 38%, oxygen - 60% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.

Answer 1

The correct option is C

Nitrogen - 21%, oxygen - 78% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.

The composition of air by volume is:

Nitrogen - 78%, oxygen - 21% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.